NEW YORK — Madison Keys completed the clean sweep for American women, giving the host country all four US Open semifinal spots for the first time in 36 years. The 15th-seeded Keys served impeccably, controlled groundstroke exchanges from the baseline and was never in trouble during a 6-3, 6-3 victory over 418th-ranked qualifier Kaia Kanepi of Estonia that lasted only 69 minutes Wednesday night. That came several hours after 20th-seeded CoCo Vandeweghe’s 7-6 (4), 6-3 elimination of 2016 runner-up and top-seeded Karolina Pliskova of the Czech Republic. Pliskova’s loss means she will be replaced at No. 1 in the rankings by Wimbledon champion Garbine Muguruza. On Thursday, Keys faces Vandeweghe — with the winner reaching her first Grand Slam final — and No. 9 seed Venus Williams meets 83rd-ranked Sloane Stephens. “Oh, my God, it feels so good. We have so many Americans to talk about in the…

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