Alexander Zverev proceeded in the US Open. He played against Botic van de Zandschulp in the quarterfinal on September 9. The match lasted for hours. It concluded after 2 a.m. At one point, Zverev called out at the umpire. The issue was a wrong ruling. It bothered him. Despite that, he continued. In the end, he triumphed. After the match, he talked with the ATP Tour. He said, 'It was a match that I needed.' Karen Khachanov also advanced. He reached the semifinals. His opponent, Blockx, stopped playing. So Khachanov triumphed by default.