Rep. Andy Biggs holds a commanding position as the trader consensus frontrunner at 91.5% implied probability to win Arizona's Republican gubernatorial primary on July 21, driven by recent polling leads over Rep. David Schweikert and the February suspension of Karrin Taylor Robson's Trump-endorsed campaign, which cleared the field and consolidated MAGA base support behind Biggs' Freedom Caucus-aligned conservatism. March polls, including Emerson College, showed Biggs with double-digit margins among GOP primary voters, bolstered by his congressional incumbency, fundraising edge, and appeal in a low-turnout primary favoring ideological purists. While Schweikert trails at 4.3% emphasizing free-market policies, potential challengers to Biggs include a late scandal, health issue, Schweikert surge via endorsements, or surprise entrant before early voting begins June 24.