Alexander Zverev moved forward in the US Open. He played against Botic van de Zandschulp in the quarterfinal on September 9. The match went on for hours. It finished after 2 a.m. At one point, Zverev yelled at the umpire. The issue was a bad call. It annoyed him. Despite that, he kept playing. In the end, he triumphed. After the match, he addressed the ATP Tour. He said, 'It was a match that I needed.' Karen Khachanov also advanced. He advanced to the semifinals. His opponent, Blockx, quit. So Khachanov triumphed by default.