US Open Tennis

Kim Clijsters, of Belgium, returns the ball to Vera Zvonareva, of Russia, during a women's championship match at the U.S. Open tennis tournament in New York, Saturday, Sept. 11, 2010. (AP Photo/Paul J. Bereswill)

Vera Zvonareva, of Russia, returns the ball to Kim Clijsters, of Belgium, during the women's championship match at the U.S. Open tennis tournament in New York, Saturday, Sept. 11, 2010. (AP Photo/Mark Humphrey)

Vera Zvonareva, of Russia, reacts following the women's championship match against Kim Clijsters, of Belgium, at the U.S. Open tennis tournament in New York, Saturday, Sept. 11, 2010. Clijsters won in two sets.(AP Photo/Paul J. Bereswill)

Kim Clijsters, right, of Belgium, is congratulated by Vera Zvonareva, of Russia, after Clijsters won the women's championship match at the U.S. Open tennis tournament in New York, Saturday, Sept. 11, 2010. (AP Photo/Paul J. Bereswill)

Kim Clijsters, left, of Belgium, and Vera Zvonareva, right, of Russia, are pictured with former tennis players Chris Evert, second from left, and Martina Navratilova, before the women's championship match at the U.S. Open tennis tournament in New York, Saturday, Sept. 11, 2010.(AP Photo/Charles Krupa)

Vera Zvonareva, of Russia, reacts following the women's championship match against Kim Clijsters, of Belgium, at the U.S. Open tennis tournament in New York, Saturday, Sept. 11, 2010. Clijsters won in two sets. (AP Photo/Charles Krupa)

Kim Clijsters, of Belgium, reacts after defeating Vera Zvonareva, of Russia, to win the women's championship match at the U.S. Open tennis tournament in New York, Saturday, Sept, 2010. (AP Photo/Charles Krupa

Kim Clijsters, of Belgium, holds the hand of her daughter, Jada Ellie, and the championship trophy after winning the finals at the U.S. Open tennis tournament in New York, Saturday, Sept. 11, 2010. (AP Photo/Charles Krupa)

Kim Clijsters, of Belgium, holds the hand of her daughter, Jada Ellie, and the championship trophy after winning the finals at the U.S. Open tennis tournament in New York, Saturday, Sept. 11, 2010. (AP Photo/Charles Krupa)

Kim Clijsters, of Belgium, steps back onto the court after kissing her husband in the stands and winning the women's championship match at the U.S. Open tennis tournament in New York, Saturday, Sept. 11, 2010. (AP Photo/Charles Krupa)

Kim Clijsters, of Belgium, kisses her husband, Brian Lynch, after winning the women's championship match at the U.S. Open tennis tournament in New York, Saturday, Sept. 11, 2010. (AP Photo/Charles Krupa)

Kim Clijsters, left, of Belgium, holds the championship trophy and Vera Zvonareva, of Russia, holds the runner up trophy following the finals at the U.S. Open tennis tournament in New York, Saturday, Sept. 11, 2010. (AP Photo/Mark Humphrey)

Kim Clijsters, of Belgium, kisses the championship trophy after winning the finals at the U.S. Open tennis tournament in New York, Saturday, Sept. 11, 2010. (AP Photo/Mark Humphrey)

Kim Clijsters, of Belgium, holds the championship trophy and her daughter, Jada Ellie, after winning the finals at the U.S. Open tennis tournament in New York, Saturday, Sept. 11, 2010. (AP Photo/Mark Humphrey)

Roger Federer, of Switzerland, serves during a men's semifinal match against Novak Djokovic, of Serbia, at the U.S. Open tennis tournament in New York, Saturday, Sept. 11, 2010. (AP Photo/Kathy Willens)

Justin Lanier and Anna Weltman of Brooklyn, N.Y. wait for the resumption of play during a rain delay in the women's doubles final match at the U.S. Open tennis tournament in New York, Sunday, Sept. 12, 2010. (AP Photo/Mark Humphrey)

Fans wait for play to resume during a rain delay at the women's doubles final at the U.S. Open tennis tournament in New York, Sunday, Sept. 2010. (AP Photo/Mark Humphrey)

Court attendants squeegee the court following a rain delay during the women's double championship match at the U.S. Open tennis tournament in New York, Sunday, Sept. 12, 2010. (AP Photo/Charles Krupa)

Fans walk the grounds during a rain delay before the men's championship match at the U.S. Open tennis tournament in New York, Sunday, Sept. 12, 2010. (AP Photo/Mike Groll)

Lights are reflected on the rain covered court at the U.S. Open tennis tournament in New York, Sunday, Sept. 12, 2010. The men's championship match was postponed until Monday due to the rain. (AP Photo/Charles Krupa)