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.

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 new Mixed Doubles format for the 2025 US Open has allowed more of the top singles players to participate in the event, and on Tuesday, Aug. 19 in New York, the Mixed Doubles tournament begins.

The winning duo will take home a $1 million prize, which is higher than most prize purses for mixed doubles major tournaments. The 16 teams will play over two days. The first round and quarterfinals take place on Tuesday inside the main show courts at the USTA National Tennis Center. The semifinals and championship match will be on Wednesday night.

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.

With the revamped US Open mixed doubles starting on Tuesday, BBC Sport looks at the positives and negatives of the controversial change.

The first week of the 2025 US Open gets started on Monday, Aug. 18 and the week will also feature the new look Mixed Doubles format.

Grand Slam singles champions such as Jannik Sinner, Carlos Alcaraz, Iga Swiatek and Madison Keys will be playing for extra money — $1 million to the winning duo — and trying to get their hands on a trophy in the U.

Jessica Pegula played extremely well during the US Open's new mixed doubles tournament on Tuesday, and yet, it was her Adidas outfit that had everyone buzzing. Pegula teamed up with Jack Draper for the mixed doubles tournament in New York.