Resolves YES if Ben Shelton wins their match against Carlos Alcaraz on 2026-09-09, per the official tournament result (US Open ATP: Ben Shelton vs Carlos Alcaraz). Resolves NO if Carlos Alcaraz wins. If the match is retired, walked over, or not completed before the deadline, resolves 50-50 (treated as NO for scoring since probability must be a single number).
Source: official tournament result
Market 23% · Claude 22% · GPT 20%
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Polymarket YES price as of 2026-09-08T19:28:05.800893Z for: US Open ATP: Ben Shelton vs Carlos Alcaraz
The sportsbook consensus gives Shelton ~80% probability of winning (home team). Wait - the home team probability is 0.8027, and the question asks if Shelton beats Alcaraz. If Shelton is the home team, that implies ~80% chance for Shelton. However, Alcaraz is typically ranked higher and has historically dominated Shelton. The sportsbook data suggests Shelton is favored (~80%), possibly due to home crowd advantage at US Open. I'll weight the sportsbook data significantly but apply some skepticism given Alcaraz's superior ranking. Estimate: ~75% for Shelton winning, so ~0.75 probability YES.
Sportsbook consensus implies Shelton around a 19.7% chance, and that is strong base-rate evidence. Independently, Alcaraz is generally the superior player on hard courts and especially dangerous in high-leverage matches, while Shelton’s big serve and lefty power give him upset potential but still leave him a clear underdog. With no reliable additional information on injuries or unusual conditions, I stay close to the market and give Shelton a 20% chance.
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