Alexander Zverev advanced in the US Open. He played against Botic van de Zandschulp in the quarterfinal on September 9. The match lasted for hours. It ended after 2 a.m. At one point, Zverev called out at the umpire. The issue was a poor decision. It frustrated him. Despite that, he proceeded. In the end, he won. After the match, he spoke to the ATP Tour. He said, 'It was a match that I needed.' Karen Khachanov also proceeded. He reached the semifinals. His opponent, Blockx, quit. So Khachanov advanced via walkover.