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PARIS, FRANCE - NOVEMBER 07: Novak Djokovic of Serbia reacts during his Men's semi finals match against Stanislas Wawrinka of Switzerland on day six of the BNP Paribas Masters at Palais Omnisports de Bercy on November 7, 2015 in Paris, France. (Photo by Aurelien Meunier/Getty Images)

PARIS, FRANCE - NOVEMBER 07:  Novak Djokovic of Serbia reacts during his Men's semi finals match against Stanislas Wawrinka of Switzerland on day six of the BNP Paribas Masters at Palais Omnisports de Bercy on November 7, 2015 in Paris, France.  (Photo by Aurelien Meunier/Getty Images)