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PARIS, FRANCE - MAY 28: Novak Djokovic of Serbia receives medical treatment during his men's singles match against Gilles Muller of Luxembourg on day five of the 2015 French Open at Roland Garros on May 28, 2015 in Paris, France. (Photo by Clive Brunskill/Getty Images)

PARIS, FRANCE - MAY 28:  Novak Djokovic of Serbia receives medical treatment during his men's singles match against Gilles Muller of Luxembourg on day five of the 2015 French Open at Roland Garros on May 28, 2015 in Paris, France.  (Photo by Clive Brunskill/Getty Images)