Venus Williams, Dinara Safina, Vera Zvonareva, and Jelena Jankovic all moved on to the quarterfinals following Thursday's matches in Stuttgart. They respectively defeated Kateryna Bondarenko, Tsvetana Pironkova, Marion Bartoli, and Alona Bondarenko.
The Bondarenko sisters, by the way, seeded 2nd in doubles, were upset in the first round by Jelena Kostanic Tosic and Tatiana Perebiynis.
Also defeated today was Patty Schnyder, who lost to Nadia Petrova, 6-4, 6-1. Petrova will play Li Na in the quarterfinals.