Aryna Sabalenka and Carlos Alcaraz are defending their U.S. Open championships. They will play on Sunday to secure spots in the quarterfinals.

Sabalenka will face Taylor Townsend, while Alcaraz will play against Tommy Paul. This will be Sabalenka's first career meeting with Townsend. Alcaraz is seeded second and is playing his first tournament after a wrist injury.

Ten Americans have reached the round of 16, the most at a Grand Slam in nearly 25 years. The last time this happened was at the 2002 U.S. Open, with 11 Americans in the fourth round.

Five of the Americans are men, including Paul, Ben Shelton, and Frances Tiafoe. Further details about the tournament are available from the source.