Vandeweghe third American in last four after beating Pliskova

Garbine Muguruza will become world No 1 on Monday after Coco Vandeweghe continued America’s dominance of the women’s US Open by beating Karolina Pliskova yesterday.

Pliskova needed to at least match her achievement of last year by reaching the final to prevent Wimbledon champion Muguruza overtaking her.

She had a set point in the opener against Vandeweghe but could not take it and the 20th seed completed a 7-6 (7/4) 6-3 victory to reach her second Grand Slam semi-final of the season.

Vandeweghe joins compatriots Venus Williams and Sloane Stephens in the last four. Victory for Madison Keys over Kaia Kanepi later would make it the first clean sweep for the host nation since 1981.

“When I won this event as a junior I always dreamed about being here on the real stage,” said the 25-year-old.

“To come together this year, it is a process. I did expect it overnight when I was 16 but now here I am and I couldn’t wish for anything better.

“I watched the match last night with Venus and think she said it best. We have to admire Serena and Venus, Lindsay (Davenport), Jennifer (Capriati). They all motivated me to be the next great American coming up and let’s make it four for four.”

Pliskova was the only top-eight seed to make it through to the quarter-finals and looked to have hit her stride after shaky early performances.

But she again struggled to find her best form, making crucial errors in the first set tie-break in particular.

She said: “Maybe I’m going to feel better in the next grand slams. Hopefully I have many more chances. There is many more grand slams to come, so I believe I can win one.”

Coco Vandeweghe has reached her second Grand Slam semi-final of the season.