Williams sisters win their way into semis

Top-ranked Serena Williams and sister Venus both won twice on 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 Mallory Burdette in a third-round match moved due to Thursday's 7 {-hour rain delay.

Venus also had double duty, downing Varvara Lepchenko in three sets before ousting 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.

"For the record, we've never played two matches on the same day," Serena told the stadium crowd. "You guys had a real treat." The sisters were the first four matches on the stadium court - and they only dropped one set combined.

"It was a quadruple-header," Venus said with a laugh. "I don't know if that's ever going to happen again." Serena is seeking her third Family Circle title after wins in her past two appearances in 2008 and 2012. Venus took this title in 2004 and scored the clinching points last September when the Washington Kastles took the World Team Tennis crown at Family Circle Tennis Center.

Serena, 31, comes in as world No. 1 having won Wimbledon, the Olympics and the U.S. Open since capturing last year's Family Circle. She added to her haul with a sixth Sony Open crown, rallying past Maria Sharapova for her 48th career WTA crown.

Venus has struggled with illness and injury in recent years. She took some six months off after being diagnosed with Sjrogen's Syndrome, an autoimmune disease, and withdrew from the Sony last month because of a sore back.

Still, Serena is wary of her sister's game and desire to win. "When I play Venus, it's never an easy opponent," she said. "She's my toughest opponent I've ever played, and I think she's beaten me the most of any player."

Venus, who'll turn 33 in June, has lost four straight to Serena since a victory in Dubai in 2009. The older Williams hasn't won a major since Wimbledon in 2008.

"The last years have been challenging and at some points difficult," Venus said. "But I think in both of our heads, we never gave up on tennis or ourselves."

On the other side of the draw, Jelena Jankovic won her 500th career match with a straight sets win over Eugenie Bouchard. "In order to have 500 wins, you have to have a pretty long career, be pretty consistent," Jankovic said.

Jankovic will face Switzerland's Stephanie Voegele in the semifinals. Voegele came from a set down to defeat second-seeded Carolina Wozniacki 3-6, 6-4, 6-3 and send the 2011 Family Circle winner up the road to Augusta National - she's scheduled to cheer on boyfriend Rory McIlroy at next week's Masters - earlier than planned.