Second seed Karolina Pliskova has gone out of the Australian Open, losing to Anastasia Pavlyuchenkov 7-6, 7-6 in the third round in Melbourne.
The Russian 13th seed won in two tie-breaks to move through to meet Anglique Kerber in the fourth round.
"I think she was playing very well today. But let's say I was about 40 per cent today of my game, so of course then she can feel so much better if I just don't play enough what I can play," Pliskova admitted on court after the match.
"I can play good one match but not really four, five in a row so far. Of course it's more pressure here so I think everybody can feel it. I think it's just about handling these things and to move on. And there is going to be more tries, so let's see if I can do better."
It's the third time in four years that 28-yea-old Pavlyuchenkova has reached round four, and she wants to repeat her success in 2006 when she won the Junior Australian Open:
"I still see my picture and it's a strange feeling, I still remember, it was a special moment, but it makes me feel, 'Damn, how old am I?'
"And beating Caroline in the final, and she retired yesterday. Everybody has their own story and their own way I guess.
"I still have energy, ambitions, motivation, I'm hungry, I want to achieve bigger things. It's a marathon and I started my marathon really, really slow and maybe she sprinted right away."
Wimbledon champion Simona Halep beat Yulia Putintseva to move through to the last sixteen.
