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.

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.

Follow scores and live text updates from the US Open mixed doubles as Jack Draper and Jessica Pegula take on Mirra Andreeva and Daniil Medvedev in the quarter-finals.

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.

The U.S. Open overhauled its mixed doubles tournament in hopes of drawing the top singles players. The defending champions don’t intend to move out of the way so easily.

Jannik Sinner has withdrawn from the US Open mixed doubles event after retiring from the Cincinnati Open due to illness. Danielle Collins and Christian Harrison will replace Sinner and Katerina Siniakova in the draw.

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