Carlos Alcaraz won the Cincinnati Open title in anticlimactic circumstances as rival Jannik Sinner retired due to illness just 23 minutes into the match.

ATP No. 1 Jannik Sinner retired just 23 minutes into the Cincinnati Open men's singles final, allowing Carlos Alcaraz to win the Rookwood Cup.

Carlos Alcaraz won the Cincinnati Open title in a little over 20 minutes Monday afternoon, after his nearest rival and world No. 1 Jannik Sinner retired through illness down 5-0. Sinner fought back tears as he was forced to quit the match, which was poised to be another instalment in the most compelling current rivalry in tennis.