Kimiko Date-Krumm sends a return to Aleksandra Wozniak of Canada during their first round match in the Pan Pacific Open tennis tournament in Tokyo...

...file photo, Lindsay Davenport of the United States waves to the crowd after her win over Aleksandra Wozniak of Canada at the U.S. Open tennis tournament in New York. Davenport is pulling out...

FILE - In this Sept.2 2009 file photo, Amelie Mauresmo of France, serves to Aleksandra Wozniak of Canada, during the second round of the U.S. Open tennis tournament in New York...

WIMBLEDON, ENGLAND - JUNE 22: Aleksandra Wozniak of Canada plays a forehand during the women's singles first round match against Francesca Schiavone...

US Serena Williams jubilates after winning against Canada's Aleksandra Wozniak during a French Open tennis round of 16 match on June 1, 2009 at Roland Garros...

US Serena Williams jubilates after winning against Canada's Aleksandra Wozniak during a French Open tennis round of 16 match on June 1, 2009 at Roland Garros...

US Serena Williams returns a ball to Canada's Aleksandra Wozniak during a French Open tennis round of 16 match on June 1, 2009 at Roland Garros...

Denmark's Caroline Wozniacki returns the ball to her Canadian opponent Aleksandra Wozniak during their 2008 Wimbledon championships tennis match at The All England Tennis Club in southwest London...

NEW YORK - AUGUST 25: Lindsay Davenport of the United States returns a forehand against Aleksandra Wozniak of Canada during Day 1 of the 2008 U.S. Open at the USTA Billie Jean...

...Day 1 NEW YORK - AUGUST 25: Lindsay Davenport of the United States returns a forehand against Aleksandra Wozniak of Canada during Day 1 of the 2008 U.S. Open at the USTA Billie Jean...

...tournament in Stanford, Calif., Saturday, July 19, 2008, in Stanford, Calif. Williams retired the match against Aleksandra Wozniak of Canada