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Mikhail Youzhny of Russia returns the ball to Roger Federer of Switzerland during their match in the first day of the ATP Dubai Duty Free Tennis Championships on February 23, 2015. AFP PHOTO / MARWAN NAAMANI (Photo credit should read MARWAN NAAMANI/AFP/Getty Images)

Mikhail Youzhny of Russia returns the ball to Roger Federer of Switzerland during their match in the first day of the ATP Dubai Duty Free Tennis Championships on February 23, 2015. AFP PHOTO / MARWAN NAAMANI        (Photo credit should read MARWAN NAAMANI/AFP/Getty Images)