Madison Keys has made it an all-American women's final four at the US Open.
The No. 15 seed beat Kaia Kanepi 6-3 6-3 to reach the semi-finals of a Grand Slam tournament for the second time.
She will face No. 20 CoCo Vandeweghe on Thursday night in the second semifinal, after ninth-seeded Venus Williams meets unseeded Sloane Stephens.
It's the first time four Americans have made the women's semifinals at the US Open since 1981, when Tracy Austin beat Martina Navratilova for the title. Chris Evert and Barbara Potter also made the last four.
The last time it happened at any Grand Slam tournament was at Wimbledon in 1985, with Navratilova and Evert joined by Zina Garrison and Kathy Rinaldi.
The US Open will be guaranteed its first all-American final since Serena Williams beat sister Venus in 2002.
Vandeweghe, who is coached by Australia's Pat Cash, eliminated No.1 Karolina Pliskova in the quarters which means Spaniard Garbine Muguruza will become world No.1 after the tournament.
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.
PA
