Resolves YES if New York Yankees win their MLB game against Arizona Diamondbacks on 2026-09-20, per mlb.com official results. Resolves NO if Arizona Diamondbacks win. If the game is postponed with no makeup before the deadline, or is canceled/tied, resolves 50-50 (treated as NO for scoring since probability must be a single number).
Source: mlb.com official results
GLM 52% · Claude 51% · Market 47% · GPT 46%
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Team quality favors the Yankees: 89-65 (.578) vs 81-74 (.523). A log5 estimate gives New York ~55% on a neutral field; Arizona's home field cuts that to roughly 52-53%. The pitching matchup is the main counterweight: Corbin Burnes is elite when healthy, but he returned from June 2025 Tommy John surgery, so rust and pitch limits are likely, while Will Warren is a back-end starter. This partly offsets, not fully reverses, the quality gap. Motivation also slightly favors New York, still jockeying for playoff seeding, while Arizona is likely eliminated. Netting these factors, I estimate about 52%.
Yankees (89-65) have a better record than Diamondbacks (81-74), suggesting higher team quality. Yankees are away, which slightly disadvantages them. Will Warren vs Corbin Burnes - Burnes is a strong pitcher which somewhat offsets the Yankees' record advantage. The sportsbook implies ~53% for Yankees. Given Yankees' superior record but away status and facing a quality pitcher in Burnes, I estimate roughly even odds with slight Yankees edge from record differential, landing near 51%.
Polymarket YES price as of 2026-09-20T18:38:01.033276Z for: New York Yankees vs. Arizona Diamondbacks
Arizona has key edges: home field and Corbin Burnes starting against Will Warren. The Yankees are the better overall team by record (89-65 vs 81-74), which keeps this close despite being on the road. A neutral-field estimate would favor New York modestly on team strength, but Burnes versus Warren likely swings several points back toward Arizona, with home field adding a bit more. That leaves the Yankees as a slight underdog overall. I place them a little below 50%, somewhat lower than the market-implied number because the pitching matchup looks meaningfully unfavorable.
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