NEW YORK - SEPTEMBER 07: Roger Federer of Switzerland returns a shot against Tommy Robredo of Spain during day eight of the 2009 U.S. Open at the USTA Billie Jean...

Argentinian player Juan Martin Del Potro jubilates after winning against Spanish player Tommy Robredo during a French Open tennis quarter final match on June 3, 2009 at Roland Garros Stadium...

MADRID, SPAIN - MAY 14: Andy Murray of Great Britain plays a backhand against Tommy Robredo of Spain in their third round match during the Madrid Open tennis tournament at the Caja...

...Guillermo Coria of Argentina hits a backhand during the Men's Singles first round match against Tommy Robredo of Spain on day two of the French Open at Roland Garros on May 26, 2008...

Serbia's Novak Djokovic returns the ball to Spain's Tommy Robredo during the Italian Rome Masters tennis tournament in Rome, Thursday, April 30, 2009. Djokovic won 6...

...Day 10 INDIAN WELLS, CA - MARCH 18: Andy Murray of Great Britain returns a forehand to Tommy Robredo during the BNP Paribas Open at the Indian Wells Tennis Garden on March 18, 2009 in...

NEW YORK - AUGUST 29: Marat Safin of Russia serves against Tommy Robredo of Spain during Day 5 of the 2008 U.S. Open at the USTA Billie Jean...

Andy Roddick of U.S. serves the ball to Tommy Robredo, from Spain, during their tennis match at the Madrid Masters, in Madrid, Wednesday, Oct. 15, 2008...

Sep 2, 2008; Flushing Meadows, NY, USA; Novak Djokovic (SRB) returns a shot against Tommy Robredo (ESP) during the quarterfinals of the 2008 US Open Championship. Djokovic defeated Robredo 4-6, 6...

Sep 2, 2008; Flushing Meadows, NY, USA; Novak Djokovic (SRB) between points during his match against Tommy Robredo (ESP) during the quarterfinals of the 2008 US Open Championship. Djokovic defeated Robredo 4-6, 6...

NEW YORK - SEPTEMBER 02: Novak Djokovic of Serbia points to his head while taking on Tommy Robredo of Spain during Day 9 of the 2008 U.S. Open at the USTA Billie Jean...

NEW YORK - SEPTEMBER 02: Novak Djokovic of Serbia reacts as he defeats Tommy Robredo of Spain during Day 9 of the 2008 U.S. Open at the USTA Billie Jean...

...Djokovic of Serbia has some treatment on his back from trainer Per Bastholt while taking on Tommy Robredo of Spain during Day 9 of the 2008 U.S. Open at the USTA Billie Jean...

NEW YORK - AUGUST 29: Marat Safin of Russia serves against Tommy Robredo of Spain during Day 5 of the 2008 U.S. Open at the USTA Billie Jean...

Argentina's Guillermo Coria returns the ball to Spain's Tommy Robredo during their first round match at the French Open tennis tournament in Paris on Monday May...