Ben Shelton and Karolina Muchova qualified for the US Open semifinals after beating their opponents on Wednesday.
Shelton, world number 47, defeated Frances Tiafoe with the sets of 6-2, 3-6, 7-6, and 6-2 to reach his first major semifinal at Arthur Ashe Stadium, New York.
He will take on Novak Djokovic in the next round.
In women's singles, Karolina Muchova, the No. 10-ranked player, eliminated Sorana Cirstea in straight sets to face Coco Gauff in the semifinals.
