Red, white and blue: 4 Americans left at US Open

Red, white and blue: 4 Americans left at US Open

The No. 15 seed beat Estonia's Kaia Kanepi 6-3, 6-3 on Wednesday to reach the semifinals of a Grand Slam tournament for the second time.

Finally, Keys beat qualifier Kaia Kanepi, 6-3, 6-3, on Wednesday night to complete the sweep.

"I think she was just better today", Kanepi admitted at a post-match press conference.

"I think definitely the NY crowd has stepped up in that fashion for me and really given a big positive push to my tennis this week". At 22 years old, we're finally starting to see just how good Keys can be, as it's no longer talks simply based off her potential.

Vandeweghe and Keys join No. 9 Venus Williams and Sloane Stephens, who is unseeded, in the semifinals, which start Thursday. She went 30-40 down, saved the break point and then went to match point with a forehand victor.

Williams and Stephens play their quarter-finals on Tuesday. Vandeweghe and Keys will be competing for their first final appearances, while Williams stands as the veteran among them. "But I knew in the stickier points of the second set where it was getting tight, that I had to show her that I was going to hustle down a few more extra balls". We have to admire Serena and Venus, Lindsay (Davenport), Jennifer (Capriati). "I still had doubles and mixed to play, so I was a little bit in shambles about that", Vandeweghe said.

"You know, the fact that we're playing three times in a row is interesting".

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The 25-year-old Vandeweghe, a niece of former National Basketball Association player and current league executive Kiki Vandeweghe, reached her first Grand Slam semifinal at the Australian Open in January.

Williams defeated two-time Wimbledon champion Petra Kvitova, 6-3, 3-6, 7-6 (2), to continue her impressive resurgence this season at the age of 37. She won her first Wimbledon 17 years ago.

"I mean, I don't care", Pliskova said.

Garbine Muguruza is set to become the new world number one when the updated rankings are released on Monday. 2017 has been a banner year for the 23-year-old, as she captured the Western & Southern Open in Cincinnati earlier this summer.

It's the first time since 1981 the US Open final four is an all-American affair. Pliskova, 25, of the Czech Republic, had held the No. 1 spot since July 17.

"When I won this event as a junior at 16 I always dreamed about being here on the real stage, moving through the draw", Vandeweghe said afterwards. "If someone told me this is where I would be, right before Wimbledon, I wouldn't have believed you". I played her last time in Stuttgart, I think, so it was clay, a little bit different story. "So for me, no changes", Pliskova said.