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A fan takes a selfie with Roger Federer of Switzerland during a training session at the Brisbane International tennis tournament on January 3, 2016. AFP PHOTO / Saeed KHAN -- IMAGE RESTRICTED TO EDITORIAL USE - STRICTLY NO COMMERCIAL USE / AFP / SAEED KHAN (Photo credit should read SAEED KHAN/AFP/Getty Images)

A fan takes a selfie with Roger Federer of Switzerland during a training session at the Brisbane International tennis tournament on January 3, 2016. AFP PHOTO / Saeed KHAN
-- IMAGE RESTRICTED TO EDITORIAL USE - STRICTLY NO COMMERCIAL USE / AFP / SAEED KHAN        (Photo credit should read SAEED KHAN/AFP/Getty Images)