PRAGUE, Czech Republic – Top seed Svetlana Kuznetsova was made to work hard for her place in the quarterfinals of the J&T Banka Prague Open, eventually subduing a dogged Madison Brengle in three sets.

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On another bitterly cold afternoon in the Czech capital, Kuznetsova took some time to warm to the challenge, running out a 5-7, 6-4, 6-3 winner after just over two hours on court.

“Yesterday was really hard and today as well,” Kuznetsova said. “It looks like it’s warmer, but it’s not – thankfully it wasn’t snowing! Today I put the heat cream on, and almost all the clothes I have with me.”

The conditions affected the Russian’s game as well much as her wardrobe choices, and it was not until the latter stages that she began to resemble the player that impressed so much en route to the Miami final earlier this month.

“It’s difficult, especially on the clay, because I like when the ball bounces high, and here it doesn’t bounce at all,” she added. “It was a little bit ugly, but sometimes you need to win ugly matches, especially for me.

“In the first set I didn’t really play my game. I was struggling to move and when I don’t move my game is a little bit off.”

Earlier in the day, Lucie Safarova continued her progress when Lucie Hradecka retired from their all-Czech clash with a neck injury. Safarova, who led 6-4, 2-0 at the time of the retirement, is now through to the last eight of a WTA event for the first time since last August, and there she will face Hsieh Su-Wei.

“Obviously it’s not the best feeling after the match to win like that, but I think I played really well in the first set, served really well – there was a key moment at 5-4 when I was down 40-0 and aced her three times,” Safarova said. “Overall I’m happy with my game and ready for the next one.”

Also advancing with minimum fuss was No.3 seed Karolina Pliskova, who defeated Katerina Siniakova, 6-2, 6-4. Next up will be another hard-hitter, Camila Giorgi, after she overcame a late wobble to defeat qualifier Virginie Razzano, 6-1, 7-5.