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

DUBAI, UNITED ARAB EMIRATES - FEBRUARY 23: Roger Federer of Switzerland in action against Mikhail Youzhny of Russia during day one of the ATP Dubai Duty Free Tennis Championships at the Dubai Duty Free Stadium on February 23, 2015 in Dubai, United Arab Emirates. (Photo by Francois Nel/Getty Images)

Getty Images Sport Francois Nel