Several MLB clubs enter early July 2026 with nearly identical overall ABS challenge success rates clustered between 50% and 55%, reflecting the tight distribution of the current market. Success hinges on the combined accuracy of batters, pitchers, and especially catchers when initiating the limited challenges each game, with teams retaining the right to challenge only after successful overturns. Recent data show modest edges for clubs whose catchers post higher overturn percentages on defensive calls, while offensive challenges have hovered closer to 48% league-wide. Small sample sizes through the first half of the schedule, varying usage rates, and day-to-day adjustments in challenge strategy continue to compress differences among contenders, leaving the leaderboard fluid heading into the summer months.