CHARLESTON, South Carolina, April 6 (BSS/AFP) - Results on Thursday from the WTA claycourt tournament in Charleston, South Carolina (x denotes seeding):

3rd rd:

Polona Hercog (SLO x14) bt Marion Bartoli (FRA x3) 6-4, 1-6, 6-4

Nadia Petrova (RUS x13) bt Anastasia Pavlyuchenkova (RUS x8) 6-1, 6-4

Vera Zvonareva (RUS x4) bt Stefanie Voegele (SUI) 5-7, 6-3, 6-4

Lucie Safarova (CZE x9) bt Aleksandra Wozniak (CAN) 6-2, 6-7 (4/7), 6-1

Sabine Lisicki (GER x6) bt Yaroslava Shvedova (KAZ) 7-5, 6-4

Serena Williams (USA x5) bt Marina Erakovic (NZL x17) 6-2, 6- 2

Venus Williams (USA) bt Anastasia Rodionova (AUS) 7-5, 6-2

Samantha Stosur (AUS x2) leads Galina Voskoboeva (KAZ) 4-2 postponed (rain match will resume Friday)