Sloane Stephens reached her first Grand Slam semifinal since 2013 by beating 16th-seeded Anastasija Sevastova 6-3, 3-6, 7-6 (4) at the U.S. Open.
The 83rd-ranked Stephens has won 13 of her past 15 matches. She was one of four American women in the quarterfinals at Flushing Meadows, the most since five made it that far 15 years ago.
Sevastova beat Maria Sharapova in the fourth round and was trying to reach the first major semifinal of her career. She received treatment from a trainer late in the first set Tuesday for a problem with her upper right leg.
Stephens went 11 months between tournaments because of surgery on her left foot in January, returning to competition at Wimbledon in July.
Her ranking was 934th before she reached consecutive semifinals at hard-court tournaments in Toronto and Cincinnati in August.
Her only previous trip to the final four at a major tournament came at the Australian Open four years ago.
TOKYO — Defending champion Caroline Wozniacki upset top-ranked Garbine Muguruza 6-2, 6-0 to advance to the final of the Pan Pacific Open on Saturday.
Wozniacki, a champion here in 2010 and 2016, converted six of seven break points to reach her seventh final of 2017.
Playing in her first tournament since earning the WTA’s top ranking, Wimbledon champion Muguruza had 29 unforced errors to drop the final 10 games of the match.
“I didn’t feel that fresh,” Muguruza said. “In the long rallies, I was struggling a little bit. I felt my energy was a little bit low, but I think she just had a good match. I didn’t make the important shots in the important moments so the match went to her side very fast.”
Sixth-ranked Wozniacki will face Anastasia Pavlyuchenkova in Sunday’s final. Pavlyuchenkova rallied from being down 3-0 in the final set to beat former No. 1 Angelique Kerber 6-0, 6-7 (4), 6-4.
Pavlyuchenkova, who is aiming for her third title of 2017, broke serve seven times and won six of the final seven games.
Pavlyuchenkova admitted her slow start in the final set had her thinking about the next tournament in China.
“I was already thinking about going to Wuhan,” Pavlyuchenkova said. “In my head I was booking flights. But at the same time, I always fight to the last point.”
ST. PETERSBURG, Russia — Fabio Fognini will play for his second ATP title of the year and Damir Dzumhur for the first of his career in the final of the St. Petersburg Open.
The third-seeded Fognini eliminated top-seeded Roberto Bautista Agut of Spain 2-6, 7-6 (7), 7-5 (5) in 2 1/2 hours in the semifinals on Saturday. The Italian broke Bautista Agut only once, in the second set.
Fognini also beat Bautista Agut in July at Gstaad, where he won his fourth career title, all on clay. St. Petersburg, where he was a finalist in 2012, is on an indoor hard-court.
The unseeded Dzumhur defeated eighth-seeded Jan-Lennard Struff of Germany 6-3, 7-5. In a match of vulnerable servers, Struff was the least effective in winning less than 30 percent of his second serves and losing his serves five times.
“I was making him play more, because he likes fast points,” Dzumhur said. “I won because I didn’t give him easy balls that he likes.”
Dzumhur, of Bosnia and Herzegovina, is at a career-high ranking of 55 after reaching his first career final last month in Winston-Salem.
He has a 0-2 win record against Fognini.