CHARLESTON, S.C. — Serena Williams had completed a dazzling display of tennis to dominate her opponent and advance to her fourth finals of the year at the Family Circle Cup on Saturday.

CHARLESTON, S.C. — Serena Williams had completed a dazzling display of tennis to dominate her opponent and advance to her fourth finals of the year at the Family Circle Cup on Saturday.

Her excitement, though, was over the weeklong play of sister Venus despite big sister's inability to slow down Serena.

"She's had a great week," Serena said

So has Serena, who won her 14th straight match here with a 6-1, 6-2 victory over Venus Williams — the most one-sided result in the sisters' long, intense rivalry.

Serena got started early with her powerhouse serves and rarely let Venus gain any ground.

Still, Serena understands better than almost anyone what her older sister has gone through in recent years due to injury and illness.

"I think (the week) is positive looking for her and she can see the next, her next tournament be really more positive," Serena said.

Serena Williams goes for her second straight tournament title and third here overall Sunday when she'll take on Jelena Jankovic, a three-set winner over Stefanie Voegele.

It was the first time since 2009 the Williams sisters were playing each other in a tournament and the excitement was felt throughout the Family Circle Tennis Center. A crowd of 9,538 filled Billie Jean King Court, a single-session record since the tournament moved from Hilton Head to Charleston in 2001.

Serena has won five straight in their series and leads 14-10 since they first faced each other at the Australian Open in 1998. Back then, Venus was the more polished player and began a run of five victories over Serena the first six times they played.

Things turned in 2002 with Serena's 6-2, 6-2 win in Miami, the previous biggest sibling margin before this one.

Since, Serena holds a 13-5 mark and has played some of her best tennis the past year.

Since capturing this title in April 2012, Serena has won Wimbledon, Olympic gold, the U.S. Open and reclaimed the world's No. 1 ranking.

Jankovic dropped a second-set tiebreaker and trailed 2-0 to Voegele. But the former No. 1 took the final six games to advance.

Jankovic has won four of nine career matches with Serena Williams, including a victory in Rome in their last meeting on clay in 2010. She understands Williams is playing at a very high level right now. "But I'm going to go out there and try to play my best tennis and try to go for it," Jankovic said. "I have nothing to lose, and it's a great occasion. It's the finals."

Davis Cup

At Boise, Idaho, the United States trails Serbia 2-1 in a Davis Cup quarterfinal after the top-ranked doubles team of Bob and Mike Bryan lost to Serbia's Nenad Zimonjic and Ilija Bozoljac 7-6 (5), 7-6 (1), 5-7, 4-6, 15-13.

Fans were on the edge of their seats throughout the 4 hour, 23 minute match and kept the place alive with their cheering.

The Serbians had their share of fans who were waving Serbian flags and urging their team.

The Bryans, who have a 20-4 Davis Cup doubles record together, have only played two five-set matches in Davis Cup competition and both took place this year. They were upset by Marcelo Melo and Bruno Soares of Brazil in the Davis Cup first round in February and by the Serbians in Boise.

In other Davis Cup quarterfinals, Italy and Canada are tied 1-1, France and Argentina are also tied 1-1 and the Czech Republic has a 2-1 lead over Kazakhstan.

Zimonjic served three aces in the final game of the match against the U.S. with an ace on the second match point of that 28th game. It was a clutch final moment performance by a multiple Grand Slam doubles champion, who was key in Serbia's only Davis Cup victory in 2010.