1 ranked Jannik Sinner has withdrawn from the Cincinnati Open because of a right knee injury, putting another question mark over his preparation for the U.S. Open later this month. Sinner added that he was disappointed to miss the tournament and would now concentrate on preparing for the U.S. Open. Sinner was the Cincinnati champion in 2024 and reached the final again last year, when he was defeated by Carlos Alcaraz. His absence means neither of the world’s top two-ranked men’s players will compete in Cincinnati, with Alcaraz continuing to recover from a wrist injury. The U.S. Open begins Aug. 30 in New York, leaving Sinner with limited competitive preparation before the year’s final Grand Slam.