The scheduling of the Cincinnati Open final on Monday has caused chaos ahead of the start of the new-look US Open mixed doubles event

The No. 1-ranked Sinner, the defending champion in singles at Flushing Meadows, was supposed to compete in mixed doubles with Katerina Siniakova.

World number one Jannik Sinner has withdrawn from the US Open mixed doubles, organizers said on Tuesday. Sinner retired from Monday's Cincinnati Open final against Carlos Alcaraz due to illness and his participation in the doubles alongside Katerina Siniakova had been in doubt.

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.

In the U.S. Open, the format is being redesigned as a popularity contest engineered to generate buzz.

Carlos Alcaraz, Novak Djokovic and Alexander Zverev are set to play along with Iga Swiatek and 45-year-old veteran Venus Williams when the US Open mixed doubles takes centre stage like never before. Instead of being crammed in amid the singles and doubles matches at the main draw event,

Williams is a longtime resident of Palm Beach Gardens while Opelka has lived in the Delray Beach/Boca Raton area since he was a teenager.

The US Open mixed doubles event gets underway next week, before the main singles event, with Emma Raducanu and Carlos Alcaraz among the star names involved