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."

Sinner threw in the towel down 5-0 to No. 2 Alcaraz in the Cincinnati final after he clearly was not right to start the match. Alcaraz won his 22nd ATP title and sixth this year.

Carlos Alcaraz won the Cincinnati Open title in little over 20 minutes Monday afternoon, after his nearest rival and world No. 1 Jannik Sinner retired through illness down 5-0.