STUTTGART, Germany – Petra Kvitova snatched victory from the jaws of defeat against Monica Niculescu on Thursday to secure a quarterfinal spot at the Porsche Tennis Grand Prix.

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In the opening round, Kvitova barely broke a sweat, defeating the outgunned Louise Chirico in under an hour. However, against Niculescu she faced a very different test, and for the best part of two sets it was one she was failing.

After seeing a commanding second set lead disappear, Kvitova was forced to fend off three set points at 6-5, saving the first with the help of a net cord, before producing a couple of delightful touches to escape the immediate danger.

She rode this momentum through the subsequent tie-break, leaving Niculescu to rue her missed opportunities. This frustration boiled over in the decider, Kvitova easing into a 3-1 lead as she cantered down the home straight.

Kvitova’s reward is a meeting with No.3 seed Garbiñe Muguruza on Friday. Also advancing to the last eight was Carla Suarez Navarro, who impressed during a 6-2, 6-2 victory over Anna-Lena Friedsam.