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.

Alexander squandered game points in the first game of the second set and experienced another break. Zverev pulled it back in the next one, leveling the score at 1-1 but sitting powerless on the court while his rival was changing his shirt.

Alexander Zverev advanced to the Cincinnati Open semifinals, overcoming Ben Shelton in straight sets. Despite health struggles mid-match, the 2021 Cincinnati champion secured his fourth recent semifinal appearance.