Top-ranked Aryna Sabalenka overcame early struggles to defeat Taylor Townsend 6-4, 6-3 and reach the US Open quarterfinals. Townsend broke Sabalenka's serve three times in the opening set, but Sabalenka regained her confidence and dominated the second. "Basically, I was just trying to stay focused on myself and play not only point by point but ball by ball," Sabalenka said. "I'm happy that I was able to turn it around in that second set." This marked their first meeting, with Townsend earning praise for her aggressive net play and returning ability.

Meanwhile, second-seeded Carlos Alcaraz seeks to extend his dominance when he faces Tommy Paul at Arthur Ashe Stadium. Alcaraz, returning from a four-month wrist injury, carries a 17-match Grand Slam winning streak and is 12-0 against U.S. men at majors. The American contingent shines, as Townsend and Paul join ten other Americans in the round of 16, the most at a Grand Slam since the 2002 US Open.

At just 20 years old, Learner Tien made history as the youngest American man in the fourth round since Andy Roddick in 2002, defeating Jakub Mensik in a five-set thriller. Other Sunday action features Ben Shelton against Stefanos Tsitsipas, Emma Navarro versus Anna Kalinskaya, and Jessica Pegula versus Sorana Cirstea.