5th seed Vinci loses to Barthel at Open GDF Suez

Vinci struggled in the second set, dropping two of her service games, before Barthel immediately earned a break against the Italian to start the third. Vinci, who is ranked 16th, broke back but the 45th-ranked Barthel earned two more breaks to take the match.

Barthel will meet third-seeded Marion Bartoli in the quarterfinals after the Frenchwoman fought back from four set-points down to defeat American Christina McHale 7-5, 6-1.

Second-seeded Petra Kvitova of the Czech Republic also advanced to the quarters, beating Stefanie Voegele of Switzerland 7-6 (5), 6-3.

In a first-round match, sixth-seeded Lucie Safarova of the Czech Republic recovered from an early scare to beat Lourdes Dominguez Lino of Spain 2-6, 6-1, 6-1.

Safarova next faces Frenchwoman Alize Cornet in the second round.

Magdalena Rybarikova of Slovakia will face top-seeded Sara Errani of Italy after beating fellow qualifier Virginie Razzano of France 6-4, 3-6, 6-3.

Also moving on to the second round were Kiki Bertens of the Netherlands and Yanina Wickmayer of Belgium.