ATP Dubai Duty Free Tennis Championships - Day Six [Getty Images]

DUBAI, UNITED ARAB EMIRATES - FEBRUARY 28: Novak Djokovic of Serbia looks on against Roger Federer of Switzerland during their men's singles Final match of the ATP Dubai Duty Free Tennis Championships at the Dubai Duty Free Stadium on February 28, 2015 in Dubai, United Arab Emirates. (Photo by Amin Mohammad Jamali/Getty Images)

Getty Images Sport Amin Mohammad Jamali