DUBAI, UNITED ARAB EMIRATES - FEBRUARY 28:  Roger Federer of Switzerland (R) and Novak Djokovic of Serbia holds the trophy after winning the final match during men's singles Final match of the ATP Dubai Duty Free Tennis Championships at the Dubai Duty Free StadiumÊon February 28, 2015 in Dubai, United Arab Emirates.  (Photo by Amin Mohammad Jamali/Getty Images)