Charleston quarterfinal draw is set

Here is the singles draw for the Family Circle Cup quarterfinals:

Caroline Wozniacki (1) vs. Nadia Petrova (6)
Melanie Oudin (13) vs. Vera Zvonareva (7)
Peng Shuai vs. Samantha Stosur (4)
Daniela Hantuchova (8) vs. Jelena Jankovic (2)

Petrova won the tournament in 2006, and Jankovic won it in 2007. Wozniacki was the finalist in 2009, and Zvonareva was the finalist in 2008.