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.

Jannik Sinner revealed a past promise to quit tennis by age 23 if not in the top 200 due to financial constraints. He shared this before the US Open, following his Cincinnati Open final retirement against Carlos Alcaraz due to illness.

Sinner lasted just five games before retiring from the Cincinnati Open final against Carlos Alcaraz, with just a week to go before the start of the US Open