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NEW YORK, NY - AUGUST 29: Novak Djokovic of Serbia & Montenegro embraces Jerzy Janowicz of Poland after defeating him during his first round Men's Singles match on Day One of the 2016 US Open at the USTA Billie Jean King National Tennis Center on August 29, 2016 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Al Bello/Getty Images)

NEW YORK, NY - AUGUST 29:  Novak Djokovic of Serbia & Montenegro embraces Jerzy Janowicz of Poland after defeating him during his first round Men's Singles match on Day One of the 2016 US Open at the USTA Billie Jean King National Tennis Center on August 29, 2016 in the Flushing neighborhood of the Queens borough of New York City.  (Photo by Al Bello/Getty Images)