The latest chapter of the Jannik Sinner-Carlos Alcaraz rivalry took a stunning turn on Monday when world No. 1 Sinner retired in the first set of the Cincinnati Open final due to an unspecified health issue.

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.

Jannik Sinner Sends Message Before Facing Carlos Alcaraz in Cincinnati Open Final originally appeared on Athlon Sports. It comes as no surprise that the world No. 1 and No. 2 are back again for the Cincinnati Open final. Jannik Sinner faces Carlos Alcaraz on Monday for the title.