India, Sept. 10 -- Alexander Zverev's difficult start to the US Open has given way to a dominant run, with the top seed reaching the semifinals after beating Botic van de Zandschulp in straight sets on Wednesday.

The French Open champion defeated the Dutchman 6-2, 7-5, 6-1 to become the only man to reach the semifinals at all four Grand Slam tournaments this season.

Zverev, who was also the Wimbledon runner-up, will face Karen Khachanov on Friday. The other semifinal will feature Americans Ben Shelton and Frances Tiafoe.

Zverev's path to the last four has been unusual. He became the first men's No. 1 seed in the Open era to play five-set matches in each of his first two rounds at a Grand Slam. But he has since won three consecutive mat...