Rafael Nadal

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Spain's Rafael Nadal serves the ball to Germany's Daniel Brands during their first round match of the French Open tennis tournament at the Roland Garros stadium Monday, May 27, 2013 in Paris. (AP Photo/Michel Euler)

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FILE - In this March 17, 2013 file photo, Juan Martin del Potro, of Argentina, looks up as he towels off during his match against Rafael Nadal, of Spain, at the BNP Paribas Open tennis tournament in Indian Wells, Calif. World number seven Del Potro will not be fit to play the upcoming French Open while recovering from a virus.(AP Photo/Mark J. Terrill, File)

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Rafael Nadal, of Spain, reacts after winning a game against Juan Martin del Potro, of Argentina, during their match at the BNP Paribas Open tennis tournament, Sunday, March 17, 2013, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)

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Wearing a traditional Mexican "sombrero", Spain´s Rafael Nadal bites the trophy for the cameras after beating Spain's David Ferrer in the final round match of the Mexico Open tennis tournament in Acapulco, Mexico, Saturday, March 2, 2013. Nadal blasted past top seed and defending champion David Ferrer 6-0, 6-2 in Saturday's final in a powerful performance that indicated he has quickly returned to near his best after a long-term knee injury.(AP Photo/Christian Palma)

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Spain's Rafael Nadal celebrates at the end of the Brazil Open ATP tournament final tennis match against Argentina's David Nalbandian in Sao Paulo, Brazil, Sunday, Feb. 17, 2013. Nadal won 6-2, 6-3. (AP Photo/Andre Penner)

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Spain's Rafael Nadal returns the ball to Argentina's Horacio Zeballos during the final of the VTR Open in Vina del Mar, Chile, Sunday, Feb. 10, 2013. Nadal lost to Zeballos 6-7 (2), 7-6 (6), 6-4 in Sunday's final of the VTR Open, the Spaniard's comeback tournament after seven months out with a torn tendon in his left knee,in Vina del Mar, Chile, Sundays, Feb. 10, 2013 .(AP Photo/Luis Hidalgo)

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Spain's Rafael Nadal returns the ball to Argentina's Federico Delbonis during a VTR Open tennis match in Vina del Mar, Chile, Wednesday, Feb. 6, 2013. Rafael Nadal defeated Federico Delbonis of Argentina 6-3, 6-2 on Wednesday in the second round of the VTR Open, his first singles match since losing in Wimbledon more than seven months ago. Nadal won in doubles on Tuesday with partner Juan Monaco, but the singles debut was a bigger test for the Spaniard and his injured left knee, which kept him away from the competitive game since June 28.(AP Photo/Luis Hidalgo)

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**FILE** In this June 26, 2012 file photo, Rafael Nadal of Spain returns a shot to Thomaz Bellucci of Brazil during a first round men's singles match at the All England Lawn Tennis Championships at Wimbledon, England. Nadal hasn't played tennis since June, mainly because of tendinitis in his left knee. (AP Photo/Anja Niedringhaus, File)

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**FILE** Rafael Nadal returns a shot to Thomaz Bellucci during a first-round men's singles match at the All England Lawn Tennis Championships at Wimbledon on June 26, 2012. (Associated Press)

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Rafael Nadal of Spain plays a return to Lukas Rosol of the Czech Republic during a second round men's singles match at the All England Lawn Tennis Championships at Wimbledon, England, Thursday, June 28, 2012. (AP Photo/Anja Niedringhaus)