They'll still play the full U.S. Open starting Sunday in New York, but it might save some time to skip ahead to the men's final on Sept. 7.

Defending US Open champion Jannik Sinner faces a two-front battle in New York — fitness concerns and the relentless Carlos Alcaraz. With their rivalry heating up, Sinner's title defence could hinge on his recovery as much as his tennis.

Carlos Alcaraz won the Cincinnati Open on Monday after Jannik Sinner was forced to retire due to illness. Alcaraz was already up big on Sinner, the World No. 1, when he had to retire. Sinner told the crowd that he hoped to play after feeling bad overnight, but he couldn't make it work.