Pliskova, Nadal into quarterfinals

Karolina Pliskova of the Czech Republic shakes hands with Nicole Gibbs of the United

Karolina Pliskova of the Czech Republic shakes hands with Nicole Gibbs of the United

Still, buoyed by a boisterous Grandstand crowd chanting "Ole!" and his nickname, "delPo", he never gave in or gave up.

However, the Czech was overpowered by Vandeweghe, whose 7-6 (7-4) 6-3 victory keeps alive the possibility of an all-American last four in the women's singles.

"I played well", she said.

Karolina Pliskova's eight-week run as world number one ended Wednesday with a US Open quarter-final loss, the Czech standout saying nothing has changed for her after so short a reign.

Keys, who rallied from a 4-2 deficit in the third set, is in the quarterfinals of the U.S. Open for the first time, while Svitolina's chance of obtaining the No. 1 world ranking following this tournament disappeared.

Pliskova had also played in the first match at Arthur Ashe stadium on Saturday. Thiem served for the match at 5-3, but got broken. He joked that he thought he should get a trophy just for winning this one. Kanepi, ranked No. 418 in the world, became the lowest-ranked quarterfinalist at the U.S. Open since computer rankings began in 1970.

The only bit of intrigue came after the second set, when Federer went off the court for a medical timeout.

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The Americans haven't had all four semifinalists at the U.S. Open since 1981, when Tracy Austin beat Martina Navratilova for the title.

And after sharing a break apiece midway through the second set, it was the world number 22 who held her nerve to blitz the tie-break 7-6. Different match or opposite matches what I had so far this tournament, so it was not many girls which are playing that fast and with that serve and that speed.

Vandeweghe, coached by former Wimbledon champion Pat Cash, enjoyed the faster start claiming the first break of the match in the third game but Pliskova recovered the break deficit to level the opener at 4-4 after a game which included back-to-back double faults from the American.

The last time Nadal reached this stage in NY, he went on to win his second title, beating Novak Djokovic in the final.

Of course, you always want more. "That what's I am doing".

So, too, will CoCo Vandeweghe, David Goffin and Daria Kasatkina on Monday afternoon, with Lucie Safarova, Andrey Rublev and Kaia Kanepi, respectively, providing their opposition.

The American, who joins compatriots Venus Williams and Sloane Stephens in the last four, progressed into her second Grand Slam semi-final of the year with a 7-6 (4) 6-3 success after reaching the same stage at the Australian Open in January.

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