Alexander Zverev moved forward in the US Open. He confronted Botic van de Zandschulp in the quarterfinal on September 9. The match went on for hours. It concluded after 2 a.m. At one point, Zverev called out at the umpire. The issue was a bad call. It bothered him. Despite that, he proceeded. In the end, he succeeded. After the match, he spoke to 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 won by walkover.