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PARIS, FRANCE - JUNE 07: Court attendants water the clay on Court Philippe Chatrier during a break in the men's singles semi-final match between Novak Djokovic of Serbia and Rafael Nadal of Spain on day thirteen of the French Open at Roland Garros on June 7, 2013 in Paris, France. (Photo by Clive Brunskill/Getty Images)

PARIS, FRANCE - JUNE 07:  Court attendants water the clay on Court Philippe Chatrier during a break in the men's singles semi-final match between Novak Djokovic of Serbia and Rafael Nadal of Spain on day thirteen of the French Open at Roland Garros on June 7, 2013 in Paris, France.  (Photo by Clive Brunskill/Getty Images)