Petra Kvitova says her aggressive style of play is back after stunning Garbine Muguruza in the fourth round of the US Open.
Kvitova, who returned to action in May following a knife attack at her home last December, managed to overcome the third seed at Flushing Meadows to book her place in the quarter-finals for the first time since 2015.
The Czech, who required extensive surgery on her left hand following the incident last year, battled back from 4-1 down in the first set to win the match 7-6 (7-3) 6-3 in Sunday's night session.
It was a terrific performance from the 27-year-old two-time Wimbledon champion and she will now take on American Venus Williams, a two-time winner of the final Grand Slam of the season, after she ousted Carla Suarez Navarro in three sets, winning 6-3 3-6 6-1.
Kvitova appears to have rediscovered her best form and she admits it is pleasing to be able to perform to such a high level, especially after revealing only last week that her hand did not feel completely back to normal.
"Sometimes I just really feel that the touch is there - the strength, the aggressive kind of game plan," she was quoted as saying by BBC Sport. "It's there, which I really, really appreciate. It took me a while to find it. Luckily I found it in a Grand Slam, which is nice."