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

No one will be getting an early glimpse at the men’s world No.1 singles player in Flushing this year, nor an 11-time Grand Slam doubles champion.

Sinner had to forfeit his Cincinnati Open singles final against Carlos Alcaraz after five games due to illness.