Look, we’ve all been there—you’re having what should be the match of your dreams, and suddenly your body decides to stage a full-blown revolt. But when you’re Jannik Sinner, the world’s number one tennis player,

World No. 1 Jannik Sinner is officially out of the U.S. Open Mixed Doubles tournament after falling ill in Cincinnati. The Italian retired down 5-0 against Carlos Alcaraz in the Cincinnati Open final on Monday and was due to play Mixed Doubles Tuesday with partner Kateřina Siniaková in New York.

You can watch the first two rounds of the U.S. Open mixed doubles championship starting today at 11 a.m. ET on ESPN2 and from 1 p.m. ET on ESPNEWS. The action will also stream on ESPN+. The first two rounds of the U.S. Open mixed doubles championship will be played today, beginning at 11 a.m. ET.

World no.1 Jannik Sinner reportedly wanted to partner up with the legendary Serena Williams for the revamped U.S. Open mixed doubles tournament

Jannik Sinner retired with an apparent illness 23 minutes into the first set of the Cincinnati Open final against Carlos Alcaraz.

The top-ranked Sinner will now play with 10-time women’s doubles major champion Katerina Siniakova. He had been scheduled to team with Emma Navarro

Emma Navarro withdrew from the mixed doubles championship at the U.S. Open, but Katerina Siniakova will replace her and partner with Jannik Sinner.