The Associated Press

WIMBLEDON, England - Who would win if Martina Navratilova played Wimbledon champion Serena Williams or sister Venus?

Navratilova likes her chances of beating either one when she was at her peak. She also picked seven-time winner Steffi Graf as another who might have beaten the sisters.

"On a given day, Serena could have overpowered me as she could anyone, but that's at her best," Navratilova said. "I think my average against her average would be better because I miss less."

Navratilova, 46, plays today in the mixed doubles semifinals with Leander Paes. If she advances to the final, she will be aiming for her 20th Wimbledon title to tie the record held by Billie Jean King.

TREATING VENUS: Karen Davis, the WTA trainer who treated Venus Williams' abdominal injury during her Wimbledon final and semifinal, called Williams "a tough competitor" for playing Saturday's final.

"With that type of injury, and what's required of those muscles during a service motion, I think she was very courageous to go out there and play," Davis said. "Each time she reached and extended she would feel anything from sharp pain to an increase in a dull ache."

Davis said Williams would need to rest two to four weeks to recover.

TALE OF THE TAPE: Roger Federer is 2-1 in matches against Mark Philippoussis. But the men's finalists have never played on grass, and Philippoussis won on clay in their most recent match this year.

Federer is a slight favorite because of his better all-court game and return of serve. Philippoussis may have to match the 46 aces he had - tying a Wimbledon record set by Goran Ivanisevic - in beating Andre Agassi in the quarterfinals.

Federer has yet to lose a match in the month-long grass season.

"If I could finish off the grass-court season by not losing a match, that would be just fantastic," he said.

TRIPLE DOUBLES: Todd Woodbridge and Sventlana Kuznetsova could play three rounds of mixed doubles today in a backed-up schedule. Woodbridge was busy Saturday winning men's doubles with Jonas Bjorkman and couldn't start his mixed quarterfinal.

Today, he and Kuznetsova will play their quarterfinal against Leos Friedl and Liezel Huber. If they win, next up would be a semifinal against Paes and Navratilova. The final is scheduled for late today against Andy Ram and Anastassia Rodionova.