WIMBLEDON, England - The purple “W” logo at Wimbledon might as well stand for the siblings who have made the women’s championship their own playground.

Yes, the Williams sisters are back in the Wimbledon final.

Venus and Serena Williams won in contrasting fashion Thursday to set up their fourth all-sister Wimbledon final and eighth meeting in a Grand Slam title match.

Two-time champion Serena saved a match point and overcame Elena Dementieva 6-7 (4), 7-5, 8-6 in 2 hours, 49 minutes — the longest women’s semifinal at Wimbledon in at least 40 years. Five-time winner Venus, meanwhile, needed only 51 minutes to demolish Dinara Safina 6-1, 6-0 and reach her eighth Wimbledon final.

“Oh, my God, this is my eighth final, and it’s a dream come to true to be here again and have the opportunity to hold the plate up,” Venus said.

The sisters — with 17 Grand Slam titles between them — will face off Saturday in a Fourth of July final.

“A fourth final — it’s so exciting. It was so hard before my match to watch all that drama,” Venus said, referring to Serena’s semifinal. “It was so difficult. But the hardest part is next to come, to play Serena Williams.”

A Williams has won seven of the past nine championships at the All England Club. Serena beat Venus in the 2002 and ’03 finals, and Venus defeated her younger sister last year.

“All I know is a Williams is going to win,” said the sisters’ father, Richard.

Venus would become the first woman since Steffi Graf in 1991-93 to win Wimbledon three years in a row.

There have been seven previous all-Williams championship matches at majors, with Serena holding a 5-2 lead. Overall, the sisters are 10-10.

“The more we play, the better it gets,” Serena said. “When we play our match on Saturday, you know, it’s for everything. This is what we dreamed of when we were growing up in Compton (Calif.) 20-something years ago.”

Venus said she was rooting for Serena, but will now do all she can to grab her eighth major title.

“I’m happy for her to be in the final, but I have to face her and defeat her,” Venus said. “I don’t necessarily want her to lose, but for sure I want me to win.”

The difference in the two semifinals couldn’t have been more striking.

The Serena-Dementieva match was the longest women’s Wimbledon semifinal by time since 1969; records are incomplete before then. Venus’ win was the most one-sided since Billie Jean King beat Rosie Casals by the same score in 1969.