WIMBLEDON, England -- After Venus and Serena Williams play for the Wimbledon singles title on Centre Court for the second consecutive year, they will team up to defend their doubles title on the same piece of grass today.

The defending champions reached the final at the All England Club by beating top-seeded Cara Black of Zimbabwe and Liezel Huber of the United States, 6-1, 6-2, yesterday.

"I think that we were really ready," Serena said. "We've been playing doubles a lot, even though we don't play every tournament."

The Williams sisters have won 13 career doubles titles together, including eight Grand Slam trophies and the 2000 and 2008 Olympic gold medals.

"We actually have that team camaraderie," Serena said. "We've been getting a lot of experience and we know what to do doubles-wise."

In the final, Venus and Serena will face third-seeded Samantha Stosur and Rennae Stubbs. The Australians beat Anabel Medina Garrigues and Virginia Ruano Pascual of Spain, 6-7 (3), 6-4, 6-2, in the semifinals.

In between the singles final and the women's doubles, another pair of American siblings will play for a Wimbledon title on the Fourth of July -- Bob and Mike Bryan.

The twins will face Daniel Nestor of Canada and Nenad Zimonjic of Serbia in the men's doubles final.

Who says American tennis is in decline?

Underdog Andy Roddick stunned Andy Murray and all of Great Britain yesterday afternoon with a semifinal victory that left the Centre Court audience speechless.

Certainly, the majority of the fans at the All England Lawn Tennis Club were pulling for the third-ranked Scot. Soccer icon David Beckham sent Murray a good-luck note before the match. Tennis legends Bjorn Borg and Rod Laver watched from the Royal Box.

Roddick, a two-time Wimbledon finalist, has not won a Grand Slam since the 2003 U.S. Open and was 2-6 against Murray before yesterday.

With Roddick's victory, three of the four singles finalists July 4 weekend are American -- the Williams sisters will be facing each other for the women's title today -- and there also are Americans in the finals of men's doubles (the Bryan brothers), women's doubles (the Williams sisters) and boy's juniors (Jordan Cox).

Cox of Duluth, Ga., reached the boys' final at Wimbledon yesterday by beating pal Devin Britton of Jackson, Miss., 6-3, 6-7 (5), 16-14.

"Devin and I, we're very good friends. We're practically brothers, to be honest," said Cox 17.

In the final tomorrow, Cox will play Andrey Kuznetsov of Russia, who upset third-seeded Bernard Tomic of Australia, 6-3, 7-6 (6).