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Madison Keys brushed past Kaia Kanepi and completed a sweep.
Keys, who won 6-3, 6-3 over Kanepi on Wednesday night in Arthur Ashe Stadium, became the fourth American woman in the final four of this year’s United States Open, ensuring an American champion already.
Sloane Stephens will face Venus Williams in the first of Thursday’s semifinals, and Keys will face CoCo Vandeweghe in the second.