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CINCINNATI, OH - AUGUST 22: Novak Djokovic of Serbia waves to the crowd after defeating Alexandr Dolgopolov of the Ukraine in three sets during the semifinals of the Western & Southern Open at the Linder Family Tennis Center on August 22, 2015 in Cincinnati, Ohio. (Photo by Rob Carr/Getty Images)

CINCINNATI, OH - AUGUST 22:  Novak Djokovic of Serbia waves to the crowd after defeating Alexandr Dolgopolov of the Ukraine in three sets during the semifinals of the Western & Southern Open at the Linder Family Tennis Center on August 22, 2015 in Cincinnati, Ohio.  (Photo by Rob Carr/Getty Images)