US Open Finals

The doubles team of Marcin Matkowski, left, and Mariusz Fyrstenberg, both of Poland, pose with the runner up trophy after losing 6 2, 6 2 to Jurgen Melzer, of Austria, and Philipp Petzschner, of Germany, in the mens doubles final at the U.S. Open tennis tournament in New York, Sunday, Sept. 11, 2011. (AP Photo/Elise Amendola)

The doubles team of Jurgen Melzer of Austria, left, and Philipp Petzschner of Germany look toward their supporters in the crowd after defeating Mariusz Fyrstenberg and Marcin Matkowski of Poland 6 2, 6 2 in the mens doubles final at the U.S. Open tennis tournament in New York, Sunday, Sept. 11, 2011. (AP Photo/Elise Amendola)

The doubles team of Philipp Petzschner of Germany, left, and Jurgen Melzer of Austria kiss the champions trophy after defeating Mariusz Fyrstenberg and Marcin Matkowski of Poland 6 2, 6 2 in the mens doubles final at the U.S. Open tennis tournament in New York, Sunday, Sept. 11, 2011. (AP Photo/Elise Amendo

The doubles team of Philipp Petzschner of Germany, left, and Jurgen Melzer of Austria pose with the champions trophy after defeating Mariusz Fyrstenberg and Marcin Matkowski of Poland 6 2, 6 2 in the mens doubles final at the U.S. Open tennis tournament in New York, Sunday, Sept. 11, 2011. (AP Photo/Elise Amendola)

Gisela Dulko, right, of Argentina talks with Eduardo Schwank of Argentina during a break in the mixed double finals against Melanie Oudin of the United States and Jack Sock of the United States at the U.S. Open tennis tournament in New York, Friday, Sept. 9, 2011. (AP Photo/Matt Slocum)

Melaine Oudin of the United States returns a shot during the mixed doubles finals against Gisela Dulko of Argentina and Eduardo Schwank of Argentina at the U.S. Open tennis tournament in New York, Friday, Sept. 9, 2011. Oudin's partner is Jack Sock. (AP Photo/Matt Slocum)

Novak Djokovic of Serbia returns a shot to Roger Federer of Switzerland during a semifinal match at the U.S. Open tennis tournament in New York, Saturday, Sept. 10, 2011. (AP Photo/Charles Krupa)

Novak Djokovic of Serbia reacts after winning a semifinal match against Roger Federer of Switzerland at the U.S. Open tennis tournament in New York, Saturday, Sept. 10, 2011. (AP Photo/Charles Krupa)

Gisela Dulko, right, of Argentina talks with Eduardo Schwank of Argentina during a break in the mixed double finals against Melanie Oudin of the United States and Jack Sock of the United States at the U.S. Open tennis tournament in New York, Friday, Sept. 9, 2011. (AP Photo/Matt Slocum)

In this image made with a slow shutter, Serena Williams returns a shot to Caroline Wozniacki of Denmark during a semifinal match at the U.S. Open tennis tournament in New York, Saturday, Sept. 10, 2011. (AP Photo/Charlie Riedel)

Caroline Wozniacki of Denmark returns a shot to Serena Williams during a semifinal match at the U.S. Open tennis tournament in New York, Saturday, Sept. 10, 2011. (AP Photo/Charlie Riedel)

Andy Murray of Britain, right, shakes hands with Rafael Nadal of Spain, left, after their semifinal match at the U.S. Open tennis tournament in New York, Saturday, Sept. 10, 2011. (AP Photo/Matt Slocum)

Rafael Nadal of Spain reacts after winning a semifinal match against Andy Murray of Britain at the U.S. Open tennis tournament in New York, Saturday, Sept. 10, 2011. (AP Photo/Charles Krupa)

Novak Djokovic of Serbia reacts after winning a semifinal match against Roger Federer of Switzerland at the U.S. Open tennis tournament in New York, Saturday, Sept. 10, 2011. (AP Photo/Mike Groll)