US Open: Madison Keys into quarters

Garbine Muguruza will become the new world number one on Monday

Madison Keys has made it an all-American women's final four at the U.S. Open.

There was a chance of a clean sweep later Wednesday: 15th-seeded Madison Keys of the US was scheduled to face 418th-ranked Kaia Kanepi of Estonia at night in the last women's quarterfinal. A place in the final of the US Open and potential glory beckons for only one.

Top seed Pliskova, last year's US Open runner-up, fell 7-6 (7/4), 6-3 to US 20th seed CoCo Vandeweghe, missing another chance to capture her first Grand Slam title. Sloane didn't play tennis for nearly a year after having foot surgery last summer, but has been on a winning streak since July and her ranking has jumped nearly 800 points.

Keys had wrist surgery at the end of 2016, returning to the tour at Indian Wells. "She was serving really well". You'd like to see Vandeweghe clean up on 32 unforced errors she had in her last match, but this is easily the best we've seen her play yet. "I don't think something is going to change if you are No. 2", Pliskova said afterwards. "My energy dropped. Once I got broken in the third, I just kept telling myself, 'Just try to figure it out, just get as many balls in as you can, '" Keys said.

Another American woman is into the 2017 U.S. Open semifinals.

Madison Keys of the United States celebrates after match point against Kaia Kanepi of Estonia on day ten of the US Open tennis tournament at USTA Billie Jean King National Tennis Center. She won the first set against Venus Williams but lost the match in three sets. The other match was in Stanford of this year, a match Keys won in straight sets. She turned pro in 2008, the year she won the junior title as a wild-card entry.

The two players have met twice already this season with Keys winning both times.

"Maybe I'm going to feel better on the next grand slams". "I'm excited to play".

"I don't care", she said when asked her feelings on relinquishing the rankings top spot she held for eight weeks to Spaniard Garbine Muguruza.

Keys dodged three break points, including drilling and ace down the middle, holding in the third game.

Keys, the 15th seed, told reporters that the quartet's progress was proof of "how hard we've been working".

The variety of spins and speed Keys unleashed on serve was unsettling for Kanepi. Vandeweghe, who was the junior champion in NY in 2008, reached a Grand Slam semifinal for the first time ever earlier this year at the Australian Open.

There was no reprieve while the ball was in play.

Keys set the tone in the opening game: ace at 108 miles per hour, ace at 105 miles per hour, service victor at 117 miles per hour, service victor at 112 miles per hour. The 15th-seeded American served 81 percent and pounded 10 more winners (12 to 2).