Iga Swiatek stayed on course for a second Grand Slam title of the season after battling past Jessica Pegula and into the semi-finals of the US Open.
The world No 1 and French Open champion is the only player left in either of the singles draws who has previously lifted a Slam trophy and she raised her level in a 6-3 7-6 (7-4) victory over American Pegula.
Both players struggled to hold serve and Swiatek was twice broken serving for the match, but she came through the tie-break to set up a clash with Aryna Sabalenka on Thursday.
“I wasn’t expecting this at the beginning of the tournament,” Swiatek said.
“I’m really working hard and trying to keep my expectations low. Today was such a tough match and I think the level was great, so I’m pretty happy that I handled it.