From left Serena Williams and Venus Williams

WIMBLEDON, England (AP):

Venus and Serena Williams have a busy schedule today. First they'll be on opposite sides of the Centre Court net, each trying to beat the other for the Wimbledon singles title - their seventh all-in-the-family final at a Grand Slam tournament, but first since 2003.

Then they'll pair up to play side-by-side in the women's doubles final, a berth they earned by winning in the semi-finals yesterday.

"This is what we've been aiming for," Venus said. "We haven't reached this achievement in a few years now."

She is trying to win her fifth Wimbledon championship and second in a row. The last woman to successfully defend her title at the All England Club? Serena, who won the tournament in 2002 and 2003, beating Venus in each final.

The second of those was the last time there was a Williams-Williams title match anywhere. Serena holds a 5-1 edge in Grand Slam finals and 8-7 overall.

Going to be a battle

Asked about the gap between their all-sister championship matches, Serena said: "The opponent hasn't gotten any easier, that's for sure. So it's going to be a battle again. That's just how it is."

For the sisters, this can't be easy, heading on court knowing a victory for one translates into a loss for the other. As Isha Price, an older sister to both Venus and Serena, put it: "For me, it would be hard because it would be like, 'Oh, my God. I want to win, but I want her to win, too'."

Since 2000, 11 of the 18 Wimbledon finalist slots have been filled by one Williams or the other. Today's final will be the eighth in the past nine years at Wimbledon with at least one Williams, and neither has lost a single set so far in 2008. They own a combined 14 Grand Slam singles titles - Serena leads with eight - and also have earned six Grand Slam doubles titles together. They will certainly add to that first total today and they'll have a chance to add to the second, too, when they face Lisa Raymond of the United States and Samantha Stosur of Australia.

The sisters advanced to the doubles final by beating Nathalie Dechy of France and Casey Dellacqua of Australia 6-3, 6-3.

Today when they look up at the players' guest box for support, they won't see their father and co-coach, Richard Williams. He caught a flight home to Florida because he can't stand to watch his daughters play each other.

"He said he did his job and his job was done, so I guess he's feeling good," Serena said. "No matter what happens, he's for sure going to be a winner."