Venus Williams during her semi-final victory over Russia's Elena Dementieva (left) and Serena Williams on her way to victory over China's Zheng Jie (right).

WIMBLEDON, England (AP):

VENUS AND Serena Will-iams won in straight sets yesterday to set up their third all-sister Wimbledon final and seventh Grand Slam cham-pionship matchup.

Defending champion and four-time winner Venus beat Elena Dementieva 6-1, 7-6 (3), then two-time champ Serena overcame two rain delays and served 14 aces to down China's Zheng Jie 6-2, 7-6 (5).

Tough opponents

It will be the first all-Williams final at any tournament since 2003, when Serena beat her older sister in the Wimbledon title match for the second year in a row.

Serena holds an 8-7 career edge over Venus, including 5-1 in Grand Slam finals. Since Venus won the United States Open in 2001, Serena has won five straight of their major finals.

"She's a tough opponent," Serena said. "I think she'll be the toughest person I've played. I'm excited."

Said Venus: "It's every Williams for themselves."

Improve record

Venus overpowered the fifth-seeded Dementieva in the first set and then prevailed in an error-filled tiebreaker to improve her record to 7-0 in semi-finals at the All England Club.

"I am dying for S. Williams to get through," said the 28-year-old Venus, who hasn't dropped a set in five matches and will be going for her seventh Grand Slam title.

Venus then went back out to watch her 26-year-old sister, who sat through rain breaks in both sets before cranking up her big serve, saving a set point in the second set and finishing off the 133rd-ranked Zheng to put her one win away from a ninth Grand Slam crown.

After Zheng dumped a second serve into the net on match point, Serena looked more relieved than anything to get through the match.

Venus fiddled with her fingernails as she watched alongside their father, Richard, in the players' box.

Pushed

"She definitely pushed me," Serena said of Zheng, the first Chinese player to reach a Grand Slam semi-final and first wild-card entrant to get this far at Wimbledon. "Unbelievable, and not only that she played a great game. She played like she had nothing to lose and she didn't.

"I wanted to do more than make a Wimbledon final," she added. "I'm just happy to be back in a Grand Slam final."

Richard Williams said he would fly back to the US today and doesn't plan to watch a single point of the final on television, saying he can't bear to watch his daughters playing against each other.