The Olympic gold medalist from Switzerland beat Iga Swiatek 7-6 (12), 6-3 to make the last eight in Flushing Meadows for the third time.
The 11th-seeded Bencic eliminated No. 23 Jessica Pegula 6-2, 6-4 in a rematch from the Summer Games.
Barty will face two-time Cincinnati finalist Angelique Kerber, who won her quarterfinal when Petra Kvitova retired during the second set because of a stomach problem.
Bencic will also contest the women’s doubles gold-medal match on Sunday.
The 12th-ranked Bencic beat Elena Rybakina of Kazakhstan 7-6 (2), 4-6, 6-3 on Thursday to reach the gold-medal match at the Tokyo Games.
Elina had notched one of the best wins of her career at the previous Olympics, when she defeated defending gold medallist Serena Williams at 2016 Rio en route to a quarterfinal finish.
Bencic struggled with her serve throughout and was broken four times by her Russian rival in 2-6, 2-6 loss.
Keys hit 24 winners against 13 for the sixth-seeded Bencic, who was coming off a loss to Iga Swiatek in the final of the Adelaide International on Saturday.
Bencic was already struggling in the semifinal match with a right leg problem before the end of the first set, which she won.
Top News
Latest News
