The US Open begins Sunday, with Kalshi traders giving Carlos Alcaraz a 34% chance of winning the men’s singles title, ahead of Alexander Zverev at 21%. Alcaraz will defend his title after missing the French Open and Wimbledon because of a right wrist injury sustained after his opening-match victory at the Barcelona Open. He announced his return with the message "Here we go" alongside an image taken in front of the US Open logo. Jannik Sinner, whom Alcaraz beat in last year’s final, has withdrawn because of a knee injury, leaving Alcaraz as the highest-ranked player in the men’s field. In the women’s market, Aryna Sabalenka leads at 21%, followed by Iga Swiatek at 17%.