Sinner retired with apparent illness in the first set of Monday's Cincinnati Open final against Alcaraz after digging a 5-0 deficit. Sinner remained on the court for the trophy ceremony and addressed his condition while speaking with the crowd. He didn't offer specifics, but said that he "didn't feel great."

Second-seeded Carlos Alcaraz won the Cincinnati Open title on Monday when top-seeded Jannik Sinner retired due to illness in the first set in Mason, Ohio.

The highly-anticipated final at the Cincinnati Open came to a sad ending on Monday, as World No. 1 Jannik Sinner was forced to retire from the match against No. 2 Carlos Alcaraz while trailing 5-0 due to illness. With the result, Alcaraz wins his third Masters 1000 title of the season and his eighth overall in his storied young career.