The US Open introduced a $1 million top prize in 2025 to attract some of the worlds top players to its mixed doubles tournament. Mission accomplished. The second year of the new prize format features a stacked lineup with a pairing of Novak Djokovic and Aryana Sabalenka at the top of the marquee. The US Open announced the pairing Monday as part of the initial list of entrants to the tournament. More are yet to be announced, as are the matchups.Djokovic is a 24-time Grand Slam champion and four-time singles winner at the US Open. Sabalenka is the world No. 1, a four-time Grand Slam winner and the two-time reigning US Open champion in singles. Theyll be joined be other high-profiles singles players in the mixed doubles draw.Aryna Sabalenka and Novak Djokovic, seen here at a charity event ahead of the 2024 Australian Open, headline the initial mixed doubles field for the US Open.DAVID GRAY via Getty ImagesSix-time Grand Slam champion Iga witek will join Casper Ruud again after the pairing advanced to the final of last years mixed doubles tournament. Other standout pairings include Jessica Pegula and Jack Draper, Elena Rybakina and Taylor Fritz, Leylah Fernandez and Frances Tiafoe and Naomi Osaka and Kei Nishikori.Mixed doubles specialists Sara Errani and Andrea Vavassori will also return in search of their third consecutive US Open title. The new format drew criticism last year for prioritizing big-name singles players over traditional mixed doubles specialists like Errani and Vavassori. But Errani and Vavassori prevailed over the field and defeated witek and Ruud in the final to capture the third of their four mixed doubles Grand Slam titles. Mixed doubles play is scheduled to start on Aug 24, and the final is scheduled for Aug 26. The first round of the US Open singles draw is scheduled to start on Aug. 30. US Open mixed doubles entrants (as of July 27)Aryna Sabalenka and Novak DjokovicIga Swiatek and Casper RuudElena Rybakina and Taylor FritzSara Errani and Andrea VavassoriMirra Andreeva and Andrey RublevBelinda Bencic and Flavio CobolliDiana Shnaider and Daniil MedvedevAmanda Anisimova and Learner TienAlexandra Eala and Felix Auger-AliassimeLeylah Fernandez and Frances TiafoeTaylor Townsend and Alexander ZverevElena-Gabriela Ruse and Nuno BorgesJessica Pegula and Jack DraperNaomi Osaka and Kei NishikoriKaterina Siniakova and Henry PattenPeyton Stearns and Preston Stearns