PARIS (AP) -- Eighth-seeded Kirsten Flipkens of Belgium comfortably beat Yvonne Meusburger of Austria 6-1, 6-3 at the Open GDF Suez on Thursday to set up a quarterfinal against top-seeded Maria Sharapova.
Last year's runner-up, Sara Errani, also reached the last eight in straight sets.
Flipkens converted all four of her break points against Meusburger, and the third-seeded Errani broke Karin Knapp's serve five times to win their all-Italian match 6-4, 6-3.
Elina Svitolina of Ukraine and Andrea Petkovic of Germany also advanced easily.
Svitolina beat Galina Voskoboeva of Kazakhstan 6-1, 6-2 and next plays Errani, while Petkovic beat Frenchwoman Kristina Mladenovic 6-4, 6-2.
Petkovic next faces Frenchwoman Alize Cornet, who needed three hours to beat Czech lucky loser Barbora Zahlavova Strycova 6-3, 6-7 (2), 6-3 in a match featuring 10 breaks of serve.
Zahlavova Strycova replaced second-seeded Petra Kvitova of the Czech Republic after she pulled out because of a sore throat.
''I really wanted to play, but I had to see the doctor because I wasn't feeling well,'' Kvitova said. ''When I was trying to warm up this morning, after 10 minutes I realized that I couldn't breathe, so unfortunately I have to pull out.''