SHENZHEN, China – Defending champion Agnieszka Radwanska eased into the Shenzhen Open quarterfinals with a quick-fire win over Sorana Cirstea on Tuesday.

The previous evening Radwanska had come perilously close to a shock defeat against wildcard Duan Ying Ying, but endured no such scare this time around, wrapping up a 6-0, 6-3 victory in an hour and 19 minutes.

“After a match like yesterday, there’s always less pressure today because you know you could have gone home already,” Radwanska said. “I think I was playing much better today, more confident and everything was smoother on court and that’s why the score was like that.”

Radwanska and Cirstea have known each other since their early teenage years, and were meeting each other for the eighth time in the professional ranks. After cantering through the opening set, Radwanska found herself trailing 3-0 in the second. And she as forced to delve into her bag of tricks to avoid falling further behind before steadying the ship to chalk up a sixth win over the Romanian.

Cool as you like from @ARadwanska to save break point! pic.twitter.com/LMMCCpjaNJ

— WTA (@WTA) January 3, 2017

“I know Sorana for a long time, since junior days, so of course it’s different than when you play someone for the first time. Her ranking was up and down for a long time, but I know it doesn’t matter what her ranking is she can play very good tennis – she hits the ball very hard from both sides – and I prepared for that.

“The first set I was a bit lucky – it could have been a totally different score – and in the important moments I was taking my chances, and didn’t let go. At the beginning of the second set I lost some concentration, but it’s good that I came back.”

In the last eight, Radwanska will meet Alison Riske, whom she defeated in last year’s final. Riske was equally impressive in her 6-1, 6-1 second-round victory over Tsvetana Pironkova.