Petkovic outlasts Bertens to reach last eight
Andrea Petkovic reached her fourth career Grand Slam quarter-final on Monday when she outlasted Dutch qualifier Kiki Bertens 1-6, 6-2, 7-5 in the French Open fourth round.
The German, 26, will now meet Jelena Jankovic, the Serbian sixth seed or Italian Sara Errani, ranked 10th, for a place in the semi-finals.
Petkovic, who came to Roland Garros last year ranked 136 but is now at 27 in the world, is enjoying her finest season since 2011 when she reached the last eight in Australia, Paris and at the US Open.
Bertens, ranked 148 in the world, was broken at 5-5 in the third set as she failed in her bid to become the 10th qualifier to reach the quarter-finals in the French capital.