Samantha Stosur has triumphed in a gruelling third-round clash with Carla Suarez Navarro to join fellow Australian Daria Gavrilova in the Madrid Open quarter-finals.
Stosur fought back from a set down to beat the Spanish world No.11 4-6 6-2 6-3 in the match that lasted just under two hours.
She next plays the winner of a match between Romanian Patricia Tig and Madison Keys from the US.
Meanwhile, Gavrilova will face American Louisa Chirico in the last eight following fourth seed Victoria Azarenka’s withdrawal from the tournament.
Azarenka pulled out ahead of her third-round match against Chirico, complaining of a back injury.
“Unfortunately, in my first match I think I tweaked my back a little bit,” Azarenka told reporters on Wednesday.
“The second match, obviously I was in a lot of discomfort. Having a day off I thought it was going to get better. Today before my warm-up it did feel better, but once I started hitting it came back.”
The 26-year-old Belarusian, a two-time Australian Open winner, had been the highest seed left in the women’s draw after Agnieszka Radwanska, Angelique Kerber and Garbine Muguruza all lost.
Qualifier Chirico, at 19 the youngest player left in the tournament, now plays Gavrilova, who upset defending champion Petra Kvitova 6-3 6-4 earlier on Wednesday.