Madison Keys swept Kaia Kanepi on Wednesday, completing the United States women's sweep of the US Open quarterfinals.
Sloane Stephens and Venus Williams advanced Tuesday, and CoCo Vandeweghe defeated world No. 1 Karolina Pliskova Wednesday afternoon. It is the first time that four U.S. women have made it to the semifinals of a major since Wimbledon in 1985, and the first time they've done so in New York since 1981. Venus Williams is 12 years older than the 25-year-old Vandeweghe, who is the second oldest competitor left in the Open.
Keys looked decisive over Kanepi, as the No.