FILE - This June 10, 2012 file photo shows Rafael Nadal wiping his face as he plays Serbia's Novak Djokovic during their men's final match in the French Open tennis tournament at Roland Garros stadium in Paris. Nadal still has no timetable for his return from a knee injury. The Spaniard hasn't played since losing in the second round of Wimbledon in June to little-known Lukas Rosol. (AP Photo/David Vincent, File)

Associated Press
FILE - This June 10, 2012 file photo shows Rafael Nadal wiping his face as he plays Serbia's Novak Djokovic during their men's final match in the French Open tennis tournament at Roland Garros stadium in Paris. Nadal still has no timetable for his return from a knee injury. The Spaniard hasn't played since losing in the second round of Wimbledon in June to little-known Lukas Rosol.  (AP Photo/David Vincent, File)
FILE - This June 10, 2012 file photo shows Rafael Nadal wiping his face as he plays Serbia's Novak Djokovic during their men's final match in the French Open tennis tournament at Roland Garros stadium in Paris. Nadal still has no timetable for his return from a knee injury. The Spaniard hasn't played since losing in the second round of Wimbledon in June to little-known Lukas Rosol. (AP Photo/David Vincent, File)
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