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.

US Open takes place from August 24-September 7, with reimagined mixed doubles tournament preceding it from August 19-20 as Emma Raducanu and Jack Draper square off - watch exclusive live coverage of b

Following her 7-5, 6-4 final win over Jasmine Paolini to earn her first Cincinnati Open title on Monday night, the world No. 2 took a private jet along with Carlos Alcaraz to New York to arrive in time for the U.S. Open mixed doubles tournament Tuesday.

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

Emma Raducanu and Carlos Alcaraz might have lost in the revamped US Open mixed doubles - but they win the hearts of the New York crowd.

The tennis world was excited to see the new-look US Open mixed doubles - but pessimism is drowning out the anticipation.