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Sports·MLB

Chicago Cubs – Seattle Mariners

1d 0h
Polymarket
Cubs
Cubs
2:10 AMAugust 22
Mariners
Mariners
$420.65 Vol.Polymarket
NEW

Moneyline

$415 Vol.

Spreads

$0 Vol.

Totals

$0 Vol.

Will there be a run in the first inning?

$6 Vol.

Extra Innings

$0 Vol.

In the upcoming MLB game between the Chicago Cubs and Seattle Mariners, scheduled for August 21 at 10:10PM ET: This market will resolve to "Chicago Cubs" if the Chicago Cubs win the game. This market will resolve to "Seattle Mariners" if the Seattle Mariners win the game. If the game is postponed, this market will remain open until the game has been completed. If the game is canceled entirely, with no make-up game, or ends in a tie, this market will resolve 50-50. The primary resolution source for this market is the official final statistics of the event as recognized by the governing body or event organizers. However, if the governing body or event organizers have not published final match statistics within 24 hours after the event's conclusion, a consensus of credible reporting may be used instead.In the upcoming MLB game between the Chicago Cubs and Seattle Mariners, scheduled for August 21 at 10:10 PM ET: This market will resolve to "Chicago Cubs" if the Chicago Cubs is winning the game at the conclusion of the 5th inning. This market will resolve to "Seattle Mariners" if the Seattle Mariners is winning the game at the conclusion of the 5th inning. If the game is tied at the conclusion of the 5th inning, this market will resolve to "Draw". If the game is postponed, this market will remain open until the 5th inning has been completed. If the game is canceled entirely, with no make-up game, this market will resolve 50-50. To know when a postponed game will be played, please check the home team's schedule on MLB.com for the listed team and look for the game described as a makeup game. The primary resolution source for this market is the official final statistics of the event as recognized by the governing body or event organizers. However, if the governing body or event organizers have not published final match statistics within 24 hours after the event's conclusion, a consensus of credible reporting may be used instead.In the upcoming MLB game between the Chicago Cubs and Seattle Mariners, scheduled for August 21 at 10:10 PM ET: This market will resolve to "Chicago Cubs" if the Chicago Cubs win the game by 2 or more runs. Otherwise, this market will resolve to "Seattle Mariners". If the game ends in a tie, this market will resolve to "Seattle Mariners". If the game is postponed, this market will remain open until the game has been completed. If the game is canceled entirely, with no make-up game, this market will resolve 50-50. To know when a postponed game will be played, please check the home team's schedule on MLB.com for the listed team and look for the game described as a makeup game. The primary resolution source for this market is the official final statistics of the event as recognized by the governing body or event organizers. However, if the governing body or event organizers have not published final match statistics within 24 hours after the event's conclusion, a consensus of credible reporting may be used instead.In the upcoming MLB game between the Chicago Cubs and Seattle Mariners, scheduled for August 21 at 10:10 PM ET: This market will resolve to "Seattle Mariners" if the Seattle Mariners win the game by 3 or more runs. Otherwise, this market will resolve to "Chicago Cubs". If the game ends in a tie, this market will resolve to "Chicago Cubs". If the game is postponed, this market will remain open until the game has been completed. If the game is canceled entirely, with no make-up game, this market will resolve 50-50. To know when a postponed game will be played, please check the home team's schedule on MLB.com for the listed team and look for the game described as a makeup game. The primary resolution source for this market is the official final statistics of the event as recognized by the governing body or event organizers. However, if the governing body or event organizers have not published final match statistics within 24 hours after the event's conclusion, a consensus of credible reporting may be used instead.In the upcoming MLB game between the Chicago Cubs and Seattle Mariners, scheduled for August 21 at 10:10 PM ET: This market will resolve to "Seattle Mariners" if the Seattle Mariners win the game by 2 or more runs. Otherwise, this market will resolve to "Chicago Cubs". If the game ends in a tie, this market will resolve to "Chicago Cubs". If the game is postponed, this market will remain open until the game has been completed. If the game is canceled entirely, with no make-up game, this market will resolve 50-50. To know when a postponed game will be played, please check the home team's schedule on MLB.com for the listed team and look for the game described as a makeup game. The primary resolution source for this market is the official final statistics of the event as recognized by the governing body or event organizers. However, if the governing body or event organizers have not published final match statistics within 24 hours after the event's conclusion, a consensus of credible reporting may be used instead.In the upcoming MLB game between the Chicago Cubs and Seattle Mariners, scheduled for August 21 at 10:10 PM ET: This market will resolve to "Chicago Cubs" if the Chicago Cubs win the game by 3 or more runs. Otherwise, this market will resolve to "Seattle Mariners". If the game ends in a tie, this market will resolve to "Seattle Mariners". If the game is postponed, this market will remain open until the game has been completed. If the game is canceled entirely, with no make-up game, this market will resolve 50-50. To know when a postponed game will be played, please check the home team's schedule on MLB.com for the listed team and look for the game described as a makeup game. The primary resolution source for this market is the official final statistics of the event as recognized by the governing body or event organizers. However, if the governing body or event organizers have not published final match statistics within 24 hours after the event's conclusion, a consensus of credible reporting may be used instead.In the upcoming MLB game between the Chicago Cubs and Seattle Mariners, scheduled for August 21 at 10:10 PM ET: This market will resolve to "Over" if the Chicago Cubs and Seattle Mariners combine to score 9 or more runs in this game. If the combined total is less than 9, this market will resolve to "Under". If the game is postponed, this market will remain open until the game has been completed. If the game is canceled entirely, with no make-up game, this market will resolve 50-50. To know when a postponed game will be played, please check the home team's schedule on MLB.com for the listed team and look for the game described as a makeup game. The primary resolution source for this market is the official final statistics of the event as recognized by the governing body or event organizers. However, if the governing body or event organizers have not published final match statistics within 24 hours after the event's conclusion, a consensus of credible reporting may be used instead.In the upcoming MLB game between the Chicago Cubs and Seattle Mariners, scheduled for August 21 at 10:10 PM ET: This market will resolve to "Over" if the Chicago Cubs and Seattle Mariners combine to score 8 or more runs in this game. If the combined total is less than 8, this market will resolve to "Under". If the game is postponed, this market will remain open until the game has been completed. If the game is canceled entirely, with no make-up game, this market will resolve 50-50. To know when a postponed game will be played, please check the home team's schedule on MLB.com for the listed team and look for the game described as a makeup game. The primary resolution source for this market is the official final statistics of the event as recognized by the governing body or event organizers. However, if the governing body or event organizers have not published final match statistics within 24 hours after the event's conclusion, a consensus of credible reporting may be used instead.In the upcoming MLB game between the Chicago Cubs and Seattle Mariners, scheduled for August 21 at 10:10 PM ET: This market will resolve to "Over" if the Chicago Cubs and Seattle Mariners combine to score 10 or more runs in this game. If the combined total is less than 10, this market will resolve to "Under". If the game is postponed, this market will remain open until the game has been completed. If the game is canceled entirely, with no make-up game, this market will resolve 50-50. To know when a postponed game will be played, please check the home team's schedule on MLB.com for the listed team and look for the game described as a makeup game. The primary resolution source for this market is the official final statistics of the event as recognized by the governing body or event organizers. However, if the governing body or event organizers have not published final match statistics within 24 hours after the event's conclusion, a consensus of credible reporting may be used instead.In the upcoming MLB game between the Chicago Cubs and Seattle Mariners, scheduled for August 21 at 10:10 PM ET: This market will resolve to "Yes" if at least one run is scored in the 1st inning by either the Chicago Cubs or Seattle Mariners. This market will resolve to "No" if no runs are scored in the 1st inning by either team. If the game is postponed, this market will remain open until the game has been completed. If the game is canceled entirely, with no make-up game, this market will resolve 50-50. To know when a postponed game will be played, please check the home team's schedule on MLB.com for the listed team and look for the game described as a makeup game. The primary resolution source for this market is the official final statistics of the event as recognized by the governing body or event organizers. However, if the governing body or event organizers have not published final match statistics within 24 hours after the event's conclusion, a consensus of credible reporting may be used instead.In the upcoming MLB game between the Chicago Cubs and Seattle Mariners, scheduled for August 21 at 10:10 PM ET: This market will resolve to "Chicago Cubs" if the Chicago Cubs is winning the game by 2 or more runs at the conclusion of the 5th inning. Otherwise, this market will resolve to "Seattle Mariners". If the game is tied at the conclusion of the 5th inning, this market will resolve to "Seattle Mariners". If the game is postponed, this market will remain open until the 5th inning has been completed. If the game is canceled entirely, with no make-up game, this market will resolve 50-50. To know when a postponed game will be played, please check the home team's schedule on MLB.com for the listed team and look for the game described as a makeup game. The primary resolution source for this market is the official final statistics of the event as recognized by the governing body or event organizers. However, if the governing body or event organizers have not published final match statistics within 24 hours after the event's conclusion, a consensus of credible reporting may be used instead.In the upcoming MLB game between the Chicago Cubs and Seattle Mariners, scheduled for August 21 at 10:10 PM ET: This market will resolve to "Seattle Mariners" if the Seattle Mariners is winning the game by 2 or more runs at the conclusion of the 5th inning. Otherwise, this market will resolve to "Chicago Cubs". If the game is tied at the conclusion of the 5th inning, this market will resolve to "Chicago Cubs". If the game is postponed, this market will remain open until the 5th inning has been completed. If the game is canceled entirely, with no make-up game, this market will resolve 50-50. To know when a postponed game will be played, please check the home team's schedule on MLB.com for the listed team and look for the game described as a makeup game. The primary resolution source for this market is the official final statistics of the event as recognized by the governing body or event organizers. However, if the governing body or event organizers have not published final match statistics within 24 hours after the event's conclusion, a consensus of credible reporting may be used instead.In the upcoming MLB game between the Chicago Cubs and Seattle Mariners, scheduled for August 21 at 10:10 PM ET: This market will resolve to "Over" if the Chicago Cubs and Seattle Mariners combine to score 3 or more runs by the conclusion of the 5th inning. If the combined total is less than 3, this market will resolve to "Under". If the game is postponed, this market will remain open until the 5th inning has been completed. If the game is canceled entirely, with no make-up game, this market will resolve 50-50. To know when a postponed game will be played, please check the home team's schedule on MLB.com for the listed team and look for the game described as a makeup game. The primary resolution source for this market is the official final statistics of the event as recognized by the governing body or event organizers. However, if the governing body or event organizers have not published final match statistics within 24 hours after the event's conclusion, a consensus of credible reporting may be used instead.In the upcoming MLB game between the Chicago Cubs and Seattle Mariners, scheduled for August 21 at 10:10 PM ET: This market will resolve to "Over" if the Chicago Cubs and Seattle Mariners combine to score 4 or more runs by the conclusion of the 5th inning. If the combined total is less than 4, this market will resolve to "Under". If the game is postponed, this market will remain open until the 5th inning has been completed. If the game is canceled entirely, with no make-up game, this market will resolve 50-50. To know when a postponed game will be played, please check the home team's schedule on MLB.com for the listed team and look for the game described as a makeup game. The primary resolution source for this market is the official final statistics of the event as recognized by the governing body or event organizers. However, if the governing body or event organizers have not published final match statistics within 24 hours after the event's conclusion, a consensus of credible reporting may be used instead.In the upcoming MLB game between the Chicago Cubs and Seattle Mariners, scheduled for August 21 at 10:10 PM ET: This market will resolve to "Over" if the Chicago Cubs and Seattle Mariners combine to score 5 or more runs by the conclusion of the 5th inning. If the combined total is less than 5, this market will resolve to "Under". If the game is postponed, this market will remain open until the 5th inning has been completed. If the game is canceled entirely, with no make-up game, this market will resolve 50-50. To know when a postponed game will be played, please check the home team's schedule on MLB.com for the listed team and look for the game described as a makeup game. The primary resolution source for this market is the official final statistics of the event as recognized by the governing body or event organizers. However, if the governing body or event organizers have not published final match statistics within 24 hours after the event's conclusion, a consensus of credible reporting may be used instead.In the upcoming MLB game between the Chicago Cubs and Seattle Mariners, scheduled for August 21 at 10:10 PM ET: This market will resolve to "Over" if the Chicago Cubs and Seattle Mariners combine to score 6 or more runs by the conclusion of the 5th inning. If the combined total is less than 6, this market will resolve to "Under". If the game is postponed, this market will remain open until the 5th inning has been completed. If the game is canceled entirely, with no make-up game, this market will resolve 50-50. To know when a postponed game will be played, please check the home team's schedule on MLB.com for the listed team and look for the game described as a makeup game. The primary resolution source for this market is the official final statistics of the event as recognized by the governing body or event organizers. However, if the governing body or event organizers have not published final match statistics within 24 hours after the event's conclusion, a consensus of credible reporting may be used instead.In the upcoming MLB game between the Chicago Cubs and Seattle Mariners, scheduled for August 21 at 10:10 PM ET: This market will resolve to "Over" if the Chicago Cubs and Seattle Mariners combine to score 7 or more runs by the conclusion of the 5th inning. If the combined total is less than 7, this market will resolve to "Under". If the game is postponed, this market will remain open until the 5th inning has been completed. If the game is canceled entirely, with no make-up game, this market will resolve 50-50. To know when a postponed game will be played, please check the home team's schedule on MLB.com for the listed team and look for the game described as a makeup game. The primary resolution source for this market is the official final statistics of the event as recognized by the governing body or event organizers. However, if the governing body or event organizers have not published final match statistics within 24 hours after the event's conclusion, a consensus of credible reporting may be used instead.In the upcoming MLB game between the Chicago Cubs and Seattle Mariners, scheduled for August 21 at 10:10 PM ET: This market will resolve to "Yes" if the game goes to extra innings. This market will resolve to "No" if the game is completed without going to extra innings. For the purposes of this market, a game goes to extra innings if play begins in any inning after the scheduled regulation innings for that game, such as the 10th inning in a standard 9-inning MLB game. If the game is postponed, this market will remain open until the game has been completed. If the game is canceled entirely, with no make-up game, this market will resolve 50-50. If the game ends in a tie before extra innings are played, this market will resolve 50-50. To know when a postponed game will be played, please check the home team's schedule on MLB.com for the listed team and look for the game described as a makeup game. The primary resolution source for this market is the official final statistics of the event as recognized by the governing body or event organizers. However, if the governing body or event organizers have not published final match statistics within 24 hours after the event's conclusion, a consensus of credible reporting may be used instead.The Chicago Cubs enter this three-game interleague series against the Seattle Mariners with a significantly stronger 74-54 record and playoff positioning in the NL Central, contrasting the Mariners' 60-68 mark and third-place AL West standing. Recent form highlights the disparity, as the Cubs posted mixed results in their prior series while the Mariners endured heavy defeats, including a 22-0 shutout loss to the Brewers. Probable starters Matthew Boyd (8-2, 4.02 ERA) for Chicago and Emerson Hancock (7-7, 3.30 ERA) for Seattle set the tone for the opener at T-Mobile Park, where both clubs face notable injury challenges—Chicago with multiple pitchers and position players sidelined or day-to-day, and Seattle missing key contributors like J.P. Crawford and others on the IL. Trader consensus reflects the Cubs' offensive edge and overall momentum heading into the matchup.

In the upcoming MLB game between the Chicago Cubs and Seattle Mariners, scheduled for August 21 at 10:10PM ET:

This market will resolve to "Chicago Cubs" if the Chicago Cubs win the game.

This market will resolve to "Seattle Mariners" if the Seattle Mariners win the game.

If the game is postponed, this market will remain open until the game has been completed. If the game is canceled entirely, with no make-up game, or ends in a tie, this market will resolve 50-50.

The primary resolution source for this market is the official final statistics of the event as recognized by the governing body or event organizers. However, if the governing body or event organizers have not published final match statistics within 24 hours after the event's conclusion, a consensus of credible reporting may be used instead.
Volume
$452
End Date
Aug 29, 2026
Market Opened
Aug 15, 2026, 9:00 AM ET

Resolution Source

https://www.mlb.com/

Resolver

0x65070BE91...
In the upcoming MLB game between the Chicago Cubs and Seattle Mariners, scheduled for August 21 at 10:10PM ET: This market will resolve to "Chicago Cubs" if the Chicago Cubs win the game. This market will resolve to "Seattle Mariners" if the Seattle Mariners win the game. If the game is postponed, this market will remain open until the game has been completed. If the game is canceled entirely, with no make-up game, or ends in a tie, this market will resolve 50-50. The primary resolution source for this market is the official final statistics of the event as recognized by the governing body or event organizers. However, if the governing body or event organizers have not published final match statistics within 24 hours after the event's conclusion, a consensus of credible reporting may be used instead.

Beware of external links.

Frequently Asked Questions

The “Cubs vs. Mariners” market on Polymarket lets you trade on the outcome of the MLB game between the Chicago Cubs and the Seattle Mariners, scheduled for August 21, 2026 at 10:10 PM ET. The primary market is the moneyline — which team will win the game — where Cubs is currently priced at 51¢ (51% implied probability) and Mariners at 50¢ (50%). Beyond the moneyline, sports markets on Polymarket may feature spreads, totals (over/under), and player props, giving you multiple ways to trade on this game. Prices reflect real-time crowd-sourced probabilities. Shares in the correct outcome pay out $1 each when the market resolves after the game ends.

As of now, the “Cubs vs. Mariners” market has generated $452 in total trading volume across all market types (moneyline, spreads, totals, and player props). This volume reflects active engagement from the Polymarket trading community, and a deeper pool of traders generally means more informative, reliable odds. You can track live price movements and trade on any market directly on this page.

To trade on “Cubs vs. Mariners,” start by choosing the market type you want to trade: Moneyline (which team wins), Spreads (margin of victory), Totals (combined score over/under), or Player Props (individual player stat lines). Each market shows the current price for each side — for example, the moneyline shows CHC at 51¢ and SEA at 50¢. Select the side you want to trade, choose Buy to take a position or Sell to close an existing one, enter your amount, and click Trade. If your chosen side is correct when the game ends and the market resolves, your shares pay out $1 each. If it’s incorrect, they pay out $0. You can also sell your shares at any time before the game ends to lock in a profit or cut a loss.

The current moneyline odds for “Cubs vs. Mariners” show Chicago Cubs at 51¢ (51% implied probability) and Seattle Mariners at 50¢ (50%). All odds update in real-time as traders buy and sell shares, reflecting the latest collective view of how this game will play out. Check back frequently or bookmark this page to follow how the odds shift as game time approaches.

The “Cubs vs. Mariners” market resolves based on the official final score of the MLB game as reported by MLB’s official results, including overtime if applicable. Moneyline markets resolve to the team that wins the game. Spread markets resolve based on the final margin of victory relative to the posted line. Totals (over/under) markets resolve based on the combined final score of both teams. Player prop markets resolve based on official box score statistics. If the game is postponed or canceled, the market resolution rules (available in the Rules section on this page) specify how that scenario is handled. We recommend reviewing the full resolution criteria before trading.
Sports·MLB

Chicago Cubs – Seattle Mariners

1d 0h
Polymarket
Cubs
Cubs
2:10 AMAugust 22
Mariners
Mariners
$420.65 Vol.Polymarket
NEW

Moneyline

$415 Vol.

Spreads

$0 Vol.

Totals

$0 Vol.

Will there be a run in the first inning?

$6 Vol.

Extra Innings

$0 Vol.

In the upcoming MLB game between the Chicago Cubs and Seattle Mariners, scheduled for August 21 at 10:10PM ET: This market will resolve to "Chicago Cubs" if the Chicago Cubs win the game. This market will resolve to "Seattle Mariners" if the Seattle Mariners win the game. If the game is postponed, this market will remain open until the game has been completed. If the game is canceled entirely, with no make-up game, or ends in a tie, this market will resolve 50-50. The primary resolution source for this market is the official final statistics of the event as recognized by the governing body or event organizers. However, if the governing body or event organizers have not published final match statistics within 24 hours after the event's conclusion, a consensus of credible reporting may be used instead.In the upcoming MLB game between the Chicago Cubs and Seattle Mariners, scheduled for August 21 at 10:10 PM ET: This market will resolve to "Chicago Cubs" if the Chicago Cubs is winning the game at the conclusion of the 5th inning. This market will resolve to "Seattle Mariners" if the Seattle Mariners is winning the game at the conclusion of the 5th inning. If the game is tied at the conclusion of the 5th inning, this market will resolve to "Draw". If the game is postponed, this market will remain open until the 5th inning has been completed. If the game is canceled entirely, with no make-up game, this market will resolve 50-50. To know when a postponed game will be played, please check the home team's schedule on MLB.com for the listed team and look for the game described as a makeup game. The primary resolution source for this market is the official final statistics of the event as recognized by the governing body or event organizers. However, if the governing body or event organizers have not published final match statistics within 24 hours after the event's conclusion, a consensus of credible reporting may be used instead.In the upcoming MLB game between the Chicago Cubs and Seattle Mariners, scheduled for August 21 at 10:10 PM ET: This market will resolve to "Chicago Cubs" if the Chicago Cubs win the game by 2 or more runs. Otherwise, this market will resolve to "Seattle Mariners". If the game ends in a tie, this market will resolve to "Seattle Mariners". If the game is postponed, this market will remain open until the game has been completed. If the game is canceled entirely, with no make-up game, this market will resolve 50-50. To know when a postponed game will be played, please check the home team's schedule on MLB.com for the listed team and look for the game described as a makeup game. The primary resolution source for this market is the official final statistics of the event as recognized by the governing body or event organizers. However, if the governing body or event organizers have not published final match statistics within 24 hours after the event's conclusion, a consensus of credible reporting may be used instead.In the upcoming MLB game between the Chicago Cubs and Seattle Mariners, scheduled for August 21 at 10:10 PM ET: This market will resolve to "Seattle Mariners" if the Seattle Mariners win the game by 3 or more runs. Otherwise, this market will resolve to "Chicago Cubs". If the game ends in a tie, this market will resolve to "Chicago Cubs". If the game is postponed, this market will remain open until the game has been completed. If the game is canceled entirely, with no make-up game, this market will resolve 50-50. To know when a postponed game will be played, please check the home team's schedule on MLB.com for the listed team and look for the game described as a makeup game. The primary resolution source for this market is the official final statistics of the event as recognized by the governing body or event organizers. However, if the governing body or event organizers have not published final match statistics within 24 hours after the event's conclusion, a consensus of credible reporting may be used instead.In the upcoming MLB game between the Chicago Cubs and Seattle Mariners, scheduled for August 21 at 10:10 PM ET: This market will resolve to "Seattle Mariners" if the Seattle Mariners win the game by 2 or more runs. Otherwise, this market will resolve to "Chicago Cubs". If the game ends in a tie, this market will resolve to "Chicago Cubs". If the game is postponed, this market will remain open until the game has been completed. If the game is canceled entirely, with no make-up game, this market will resolve 50-50. To know when a postponed game will be played, please check the home team's schedule on MLB.com for the listed team and look for the game described as a makeup game. The primary resolution source for this market is the official final statistics of the event as recognized by the governing body or event organizers. However, if the governing body or event organizers have not published final match statistics within 24 hours after the event's conclusion, a consensus of credible reporting may be used instead.In the upcoming MLB game between the Chicago Cubs and Seattle Mariners, scheduled for August 21 at 10:10 PM ET: This market will resolve to "Chicago Cubs" if the Chicago Cubs win the game by 3 or more runs. Otherwise, this market will resolve to "Seattle Mariners". If the game ends in a tie, this market will resolve to "Seattle Mariners". If the game is postponed, this market will remain open until the game has been completed. If the game is canceled entirely, with no make-up game, this market will resolve 50-50. To know when a postponed game will be played, please check the home team's schedule on MLB.com for the listed team and look for the game described as a makeup game. The primary resolution source for this market is the official final statistics of the event as recognized by the governing body or event organizers. However, if the governing body or event organizers have not published final match statistics within 24 hours after the event's conclusion, a consensus of credible reporting may be used instead.In the upcoming MLB game between the Chicago Cubs and Seattle Mariners, scheduled for August 21 at 10:10 PM ET: This market will resolve to "Over" if the Chicago Cubs and Seattle Mariners combine to score 9 or more runs in this game. If the combined total is less than 9, this market will resolve to "Under". If the game is postponed, this market will remain open until the game has been completed. If the game is canceled entirely, with no make-up game, this market will resolve 50-50. To know when a postponed game will be played, please check the home team's schedule on MLB.com for the listed team and look for the game described as a makeup game. The primary resolution source for this market is the official final statistics of the event as recognized by the governing body or event organizers. However, if the governing body or event organizers have not published final match statistics within 24 hours after the event's conclusion, a consensus of credible reporting may be used instead.In the upcoming MLB game between the Chicago Cubs and Seattle Mariners, scheduled for August 21 at 10:10 PM ET: This market will resolve to "Over" if the Chicago Cubs and Seattle Mariners combine to score 8 or more runs in this game. If the combined total is less than 8, this market will resolve to "Under". If the game is postponed, this market will remain open until the game has been completed. If the game is canceled entirely, with no make-up game, this market will resolve 50-50. To know when a postponed game will be played, please check the home team's schedule on MLB.com for the listed team and look for the game described as a makeup game. The primary resolution source for this market is the official final statistics of the event as recognized by the governing body or event organizers. However, if the governing body or event organizers have not published final match statistics within 24 hours after the event's conclusion, a consensus of credible reporting may be used instead.In the upcoming MLB game between the Chicago Cubs and Seattle Mariners, scheduled for August 21 at 10:10 PM ET: This market will resolve to "Over" if the Chicago Cubs and Seattle Mariners combine to score 10 or more runs in this game. If the combined total is less than 10, this market will resolve to "Under". If the game is postponed, this market will remain open until the game has been completed. If the game is canceled entirely, with no make-up game, this market will resolve 50-50. To know when a postponed game will be played, please check the home team's schedule on MLB.com for the listed team and look for the game described as a makeup game. The primary resolution source for this market is the official final statistics of the event as recognized by the governing body or event organizers. However, if the governing body or event organizers have not published final match statistics within 24 hours after the event's conclusion, a consensus of credible reporting may be used instead.In the upcoming MLB game between the Chicago Cubs and Seattle Mariners, scheduled for August 21 at 10:10 PM ET: This market will resolve to "Yes" if at least one run is scored in the 1st inning by either the Chicago Cubs or Seattle Mariners. This market will resolve to "No" if no runs are scored in the 1st inning by either team. If the game is postponed, this market will remain open until the game has been completed. If the game is canceled entirely, with no make-up game, this market will resolve 50-50. To know when a postponed game will be played, please check the home team's schedule on MLB.com for the listed team and look for the game described as a makeup game. The primary resolution source for this market is the official final statistics of the event as recognized by the governing body or event organizers. However, if the governing body or event organizers have not published final match statistics within 24 hours after the event's conclusion, a consensus of credible reporting may be used instead.In the upcoming MLB game between the Chicago Cubs and Seattle Mariners, scheduled for August 21 at 10:10 PM ET: This market will resolve to "Chicago Cubs" if the Chicago Cubs is winning the game by 2 or more runs at the conclusion of the 5th inning. Otherwise, this market will resolve to "Seattle Mariners". If the game is tied at the conclusion of the 5th inning, this market will resolve to "Seattle Mariners". If the game is postponed, this market will remain open until the 5th inning has been completed. If the game is canceled entirely, with no make-up game, this market will resolve 50-50. To know when a postponed game will be played, please check the home team's schedule on MLB.com for the listed team and look for the game described as a makeup game. The primary resolution source for this market is the official final statistics of the event as recognized by the governing body or event organizers. However, if the governing body or event organizers have not published final match statistics within 24 hours after the event's conclusion, a consensus of credible reporting may be used instead.In the upcoming MLB game between the Chicago Cubs and Seattle Mariners, scheduled for August 21 at 10:10 PM ET: This market will resolve to "Seattle Mariners" if the Seattle Mariners is winning the game by 2 or more runs at the conclusion of the 5th inning. Otherwise, this market will resolve to "Chicago Cubs". If the game is tied at the conclusion of the 5th inning, this market will resolve to "Chicago Cubs". If the game is postponed, this market will remain open until the 5th inning has been completed. If the game is canceled entirely, with no make-up game, this market will resolve 50-50. To know when a postponed game will be played, please check the home team's schedule on MLB.com for the listed team and look for the game described as a makeup game. The primary resolution source for this market is the official final statistics of the event as recognized by the governing body or event organizers. However, if the governing body or event organizers have not published final match statistics within 24 hours after the event's conclusion, a consensus of credible reporting may be used instead.In the upcoming MLB game between the Chicago Cubs and Seattle Mariners, scheduled for August 21 at 10:10 PM ET: This market will resolve to "Over" if the Chicago Cubs and Seattle Mariners combine to score 3 or more runs by the conclusion of the 5th inning. If the combined total is less than 3, this market will resolve to "Under". If the game is postponed, this market will remain open until the 5th inning has been completed. If the game is canceled entirely, with no make-up game, this market will resolve 50-50. To know when a postponed game will be played, please check the home team's schedule on MLB.com for the listed team and look for the game described as a makeup game. The primary resolution source for this market is the official final statistics of the event as recognized by the governing body or event organizers. However, if the governing body or event organizers have not published final match statistics within 24 hours after the event's conclusion, a consensus of credible reporting may be used instead.In the upcoming MLB game between the Chicago Cubs and Seattle Mariners, scheduled for August 21 at 10:10 PM ET: This market will resolve to "Over" if the Chicago Cubs and Seattle Mariners combine to score 4 or more runs by the conclusion of the 5th inning. If the combined total is less than 4, this market will resolve to "Under". If the game is postponed, this market will remain open until the 5th inning has been completed. If the game is canceled entirely, with no make-up game, this market will resolve 50-50. To know when a postponed game will be played, please check the home team's schedule on MLB.com for the listed team and look for the game described as a makeup game. The primary resolution source for this market is the official final statistics of the event as recognized by the governing body or event organizers. However, if the governing body or event organizers have not published final match statistics within 24 hours after the event's conclusion, a consensus of credible reporting may be used instead.In the upcoming MLB game between the Chicago Cubs and Seattle Mariners, scheduled for August 21 at 10:10 PM ET: This market will resolve to "Over" if the Chicago Cubs and Seattle Mariners combine to score 5 or more runs by the conclusion of the 5th inning. If the combined total is less than 5, this market will resolve to "Under". If the game is postponed, this market will remain open until the 5th inning has been completed. If the game is canceled entirely, with no make-up game, this market will resolve 50-50. To know when a postponed game will be played, please check the home team's schedule on MLB.com for the listed team and look for the game described as a makeup game. The primary resolution source for this market is the official final statistics of the event as recognized by the governing body or event organizers. However, if the governing body or event organizers have not published final match statistics within 24 hours after the event's conclusion, a consensus of credible reporting may be used instead.In the upcoming MLB game between the Chicago Cubs and Seattle Mariners, scheduled for August 21 at 10:10 PM ET: This market will resolve to "Over" if the Chicago Cubs and Seattle Mariners combine to score 6 or more runs by the conclusion of the 5th inning. If the combined total is less than 6, this market will resolve to "Under". If the game is postponed, this market will remain open until the 5th inning has been completed. If the game is canceled entirely, with no make-up game, this market will resolve 50-50. To know when a postponed game will be played, please check the home team's schedule on MLB.com for the listed team and look for the game described as a makeup game. The primary resolution source for this market is the official final statistics of the event as recognized by the governing body or event organizers. However, if the governing body or event organizers have not published final match statistics within 24 hours after the event's conclusion, a consensus of credible reporting may be used instead.In the upcoming MLB game between the Chicago Cubs and Seattle Mariners, scheduled for August 21 at 10:10 PM ET: This market will resolve to "Over" if the Chicago Cubs and Seattle Mariners combine to score 7 or more runs by the conclusion of the 5th inning. If the combined total is less than 7, this market will resolve to "Under". If the game is postponed, this market will remain open until the 5th inning has been completed. If the game is canceled entirely, with no make-up game, this market will resolve 50-50. To know when a postponed game will be played, please check the home team's schedule on MLB.com for the listed team and look for the game described as a makeup game. The primary resolution source for this market is the official final statistics of the event as recognized by the governing body or event organizers. However, if the governing body or event organizers have not published final match statistics within 24 hours after the event's conclusion, a consensus of credible reporting may be used instead.In the upcoming MLB game between the Chicago Cubs and Seattle Mariners, scheduled for August 21 at 10:10 PM ET: This market will resolve to "Yes" if the game goes to extra innings. This market will resolve to "No" if the game is completed without going to extra innings. For the purposes of this market, a game goes to extra innings if play begins in any inning after the scheduled regulation innings for that game, such as the 10th inning in a standard 9-inning MLB game. If the game is postponed, this market will remain open until the game has been completed. If the game is canceled entirely, with no make-up game, this market will resolve 50-50. If the game ends in a tie before extra innings are played, this market will resolve 50-50. To know when a postponed game will be played, please check the home team's schedule on MLB.com for the listed team and look for the game described as a makeup game. The primary resolution source for this market is the official final statistics of the event as recognized by the governing body or event organizers. However, if the governing body or event organizers have not published final match statistics within 24 hours after the event's conclusion, a consensus of credible reporting may be used instead.The Chicago Cubs enter this three-game interleague series against the Seattle Mariners with a significantly stronger 74-54 record and playoff positioning in the NL Central, contrasting the Mariners' 60-68 mark and third-place AL West standing. Recent form highlights the disparity, as the Cubs posted mixed results in their prior series while the Mariners endured heavy defeats, including a 22-0 shutout loss to the Brewers. Probable starters Matthew Boyd (8-2, 4.02 ERA) for Chicago and Emerson Hancock (7-7, 3.30 ERA) for Seattle set the tone for the opener at T-Mobile Park, where both clubs face notable injury challenges—Chicago with multiple pitchers and position players sidelined or day-to-day, and Seattle missing key contributors like J.P. Crawford and others on the IL. Trader consensus reflects the Cubs' offensive edge and overall momentum heading into the matchup.

In the upcoming MLB game between the Chicago Cubs and Seattle Mariners, scheduled for August 21 at 10:10PM ET:

This market will resolve to "Chicago Cubs" if the Chicago Cubs win the game.

This market will resolve to "Seattle Mariners" if the Seattle Mariners win the game.

If the game is postponed, this market will remain open until the game has been completed. If the game is canceled entirely, with no make-up game, or ends in a tie, this market will resolve 50-50.

The primary resolution source for this market is the official final statistics of the event as recognized by the governing body or event organizers. However, if the governing body or event organizers have not published final match statistics within 24 hours after the event's conclusion, a consensus of credible reporting may be used instead.
Volume
$452
End Date
Aug 29, 2026
Market Opened
Aug 15, 2026, 9:00 AM ET

Resolution Source

https://www.mlb.com/

Resolver

0x65070BE91...
In the upcoming MLB game between the Chicago Cubs and Seattle Mariners, scheduled for August 21 at 10:10PM ET: This market will resolve to "Chicago Cubs" if the Chicago Cubs win the game. This market will resolve to "Seattle Mariners" if the Seattle Mariners win the game. If the game is postponed, this market will remain open until the game has been completed. If the game is canceled entirely, with no make-up game, or ends in a tie, this market will resolve 50-50. The primary resolution source for this market is the official final statistics of the event as recognized by the governing body or event organizers. However, if the governing body or event organizers have not published final match statistics within 24 hours after the event's conclusion, a consensus of credible reporting may be used instead.

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Frequently Asked Questions

The “Cubs vs. Mariners” market on Polymarket lets you trade on the outcome of the MLB game between the Chicago Cubs and the Seattle Mariners, scheduled for August 21, 2026 at 10:10 PM ET. The primary market is the moneyline — which team will win the game — where Cubs is currently priced at 51¢ (51% implied probability) and Mariners at 50¢ (50%). Beyond the moneyline, sports markets on Polymarket may feature spreads, totals (over/under), and player props, giving you multiple ways to trade on this game. Prices reflect real-time crowd-sourced probabilities. Shares in the correct outcome pay out $1 each when the market resolves after the game ends.

As of now, the “Cubs vs. Mariners” market has generated $452 in total trading volume across all market types (moneyline, spreads, totals, and player props). This volume reflects active engagement from the Polymarket trading community, and a deeper pool of traders generally means more informative, reliable odds. You can track live price movements and trade on any market directly on this page.

To trade on “Cubs vs. Mariners,” start by choosing the market type you want to trade: Moneyline (which team wins), Spreads (margin of victory), Totals (combined score over/under), or Player Props (individual player stat lines). Each market shows the current price for each side — for example, the moneyline shows CHC at 51¢ and SEA at 50¢. Select the side you want to trade, choose Buy to take a position or Sell to close an existing one, enter your amount, and click Trade. If your chosen side is correct when the game ends and the market resolves, your shares pay out $1 each. If it’s incorrect, they pay out $0. You can also sell your shares at any time before the game ends to lock in a profit or cut a loss.

The current moneyline odds for “Cubs vs. Mariners” show Chicago Cubs at 51¢ (51% implied probability) and Seattle Mariners at 50¢ (50%). All odds update in real-time as traders buy and sell shares, reflecting the latest collective view of how this game will play out. Check back frequently or bookmark this page to follow how the odds shift as game time approaches.

The “Cubs vs. Mariners” market resolves based on the official final score of the MLB game as reported by MLB’s official results, including overtime if applicable. Moneyline markets resolve to the team that wins the game. Spread markets resolve based on the final margin of victory relative to the posted line. Totals (over/under) markets resolve based on the combined final score of both teams. Player prop markets resolve based on official box score statistics. If the game is postponed or canceled, the market resolution rules (available in the Rules section on this page) specify how that scenario is handled. We recommend reviewing the full resolution criteria before trading.