Venus and Serena Williams clash in a fourth all-sister Wimbledon final today determined to prove that their domination of the event is not a backward step for the sport.

Despite 128 players starting out in the first round last week, the two Americans are once again left to contest the final for the second successive year.

Venus won last year to clinch her fifth Wimbledon title and a seventh major; Serena was the champion in 2002 and 2003.

Despite the success, Russia's Dinara Safina, still without a major, and who was humiliated 6-1 6-0 by Venus in the most one-sided Wimbledon semi-final in 40 years on Thursday, remains a contentious world no.1.

The sisters, who are level 10-10 in career meetings, are desperate to put the controversy over rankings to one side and put on a competitive Centre Court showpiece.

"I think women's tennis is fantastic. I would never be down on it. I happen to have enormous respect for Dinara," said Venus.

"I'm not the no.1 seed so I shouldn't be expected to win but I have more experience playing on grass courts."

Venus is more concerned about quelling the competitive instincts of her sister who saved a match point in her three-set semi-final win over Elena Dementieva.

"I'm happy for Serena to be in the final, but I have to face her and defeat her. I don't necessarily want her to lose, but for sure I want me to win," said the defending champion.