By PETE IACOBELLIAP Sports Writer
CHARLESTON, S.C. (AP) - Top-ranked Serena Williams ended a long and successful day for the Williams family as she and sister Venus both won twice Friday to reach the Family Circle Cup semifinals and set up their first sibling showdown since 2009.
Serena won her 13th straight match by defeating sixth-seeded Lucie Safarova, 6-4, 6-1. Earlier, she topped 2-time NCAA doubles champ Mallory Burdette in a third-round match moved due to Thursday's 7 1/2-hour rain delay.
Venus also had double duty, rallying past Varvara Lepchenko in three sets before ousting 18-year-old Madison Keys later on Billie Jean King Court.
The Williams sisters next go for a spot in the finals Saturday. They haven't met in a tournament since the 2009 Tour Championships in Qatar. Serena holds a 13-10 lead, although they're 1-1 on clay.ORDER OF PLAY - SATURDAY, APRIL 06, 2013BILLIE JEAN KING start 1:00 pm S Williams (USA) vs  V Williams (USA)  J Jankovic (SRB) vs S Voegele (SUI) or  [WC] C Wozniacki (DEN)  A Hlavackova (CZE) / L Huber (USA) vs M Moulton-Levy (USA) / S Zhang (CHN) K Mladenovic (FRA) / L Safarova (CZE) or  V King (USA) / L Raymond (USA) vs A Barty (AUS) / A Rodionova (AUS) or  R Kops-Jones (USA) / A Spears (USA)