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

Veteran doubles experience overcame singles stardom as defending champions Andrea Vavassori and Sara Errani reached the semi-finals at the U.S. Open's reimagined mixed doubles on Tuesday, as the event kicked off with a new format and new fans.

The thought of the top men’s and women’s singles players teaming up is one that has often intrigued tennis fans around the world.

Some of the biggest stars in men's and women's tennis took the court together at the US Open for reimagined mixed doubles competition.

Venus Williams and Reilly Opelka take on Karolina Muchova and Andrey Rublev at 12:30 p.m. ET today, Aug. 19. The first day of the US Open Mixed Doubles tournament is airing on the ESPN+ streaming service. Right now, ESPN+ costs $11.99/month for new subscribers.

Big names fell early and unexpected teams broke through to steal the spotlight on Day 1 of U.S. Open mixed doubles play, headlining an electric opener packed with upsets and standout performances.

Follow live coverage of the U.S. Open mixed doubles Jannik Sinner has withdrawn from the U.S. Open mixed doubles, which begins Aug. 19 in New York. The men’s world No. 1 in singles retired after five games of his Cincinnati Open final against Carlos Alcaraz due to illness,

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.