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Novak Djokovic of Serbia dances with a fan on the court after defeating Andreas Haider-Maurer of Austria in their US Open 2015 second round men's singles match at the USTA Billie Jean King National Center September 2, 2015 in New York. AFP PHOTO/DON EMMERT (Photo credit should read DON EMMERT/AFP/Getty Images)

Novak Djokovic of Serbia dances with a fan on the court after defeating Andreas Haider-Maurer of Austria in their US Open 2015 second round men's singles match at the USTA Billie Jean King National Center September 2, 2015  in New York. AFP PHOTO/DON EMMERT        (Photo credit should read DON EMMERT/AFP/Getty Images)