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US Open Quarterfinal: Polymarket Heats Up as Carlos Alcaraz Faces Resurgent Ben Shelton

A highly anticipated US Open ATP quarterfinal between defending champion Carlos Alcaraz and American hopeful Ben Shelton is driving significant trading activity on Polymarket, with current odds heavily favoring Alcaraz despite Shelton's impressive run.

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— 3 min read

The US Open ATP prediction market for the highly anticipated quarterfinal clash between Ben Shelton and Carlos Alcaraz, originally scheduled for September 8, 2026, at 11:30 AM ET, has seen substantial activity, with a trading volume of $879,007. This market will resolve to the player who advances in the match, with specific rules for cancellations, retirements, and walkovers.

As of the scheduled match time, the market's current prices reflect a strong lean towards Carlos Alcaraz at 0.775, implying a 77.5% probability of victory, while Ben Shelton stands at 0.225, indicating a 22.5% chance. These odds set the stage for a compelling quarterfinal encounter at Arthur Ashe Stadium.

Alcaraz's Dominant Return from Injury

Carlos Alcaraz, the defending US Open champion and world No. 3, entered this tournament following a five-month layoff due to a right wrist injury, missing both the French Open and Wimbledon. Despite this extended absence, Alcaraz has showcased "superhuman" form in his return, progressing to the quarterfinals without dropping a set since the second round. His path included a convincing straight-sets victory over Tommy Paul in the Round of 16. Earlier in 2026, Alcaraz had already claimed the Australian Open title, contributing to his impressive season record of 26-3 (89.7% win rate) across 29 matches.

Shelton's Breakout Season and Home Advantage

American eighth seed Ben Shelton, currently ranked world No. 9, has also enjoyed a stellar 2026 season, securing four titles including Munich, Stuttgart, Dallas, and the Canada Masters. His strong form continued into the US Open, where he delivered a dominant performance in the fourth round, defeating Stefanos Tsitsipas in straight sets (6-2, 6-3, 6-4) without facing a single break point. Shelton, a semifinalist at the US Open in 2023, has expressed confidence in his improved game, particularly his serving and returning, suggesting that Alcaraz will face a different challenge than in their previous encounters. He also benefits from a raucous home crowd at Arthur Ashe Stadium.

Head-to-Head and Market Implications

The head-to-head record between Alcaraz and Shelton heavily favors the Spaniard, who holds a 3-0 lead. Their most recent clash was at the 2025 French Open, where Alcaraz won in four sets. The historical dominance by Alcaraz, combined with his current imperious form, largely explains the prediction market's strong preference for him. The 0.775 price for Alcaraz reflects the market's collective belief in his ability to overcome Shelton and advance to the semifinals. However, Shelton's significant improvements, his ability to win titles across different surfaces in 2026, and the energy of the home crowd could present a sterner test than the odds suggest.

As this high-stakes quarterfinal unfolds, Polymarket traders will be closely watching to see if Alcaraz can maintain his "superhuman" run or if Shelton can leverage his improved game and home advantage to stage an upset and defy the market's strong expectations.

Sources:

Market data fetched at 2026-09-08 18:18 UTC | Polymarket ID: 4322646

This article is generated by AI for informational purposes only. It does not constitute financial advice. Always do your own research before making any investment decisions. Data sourced from Polymarket and public web sources.

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