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Roger Federer of Switzerland hits a return against Rafael Nadal of Spain during the men's singles final on day 14 of the Australian Open tennis tournament in Melbourne on January 29, 2017. / AFP / PETER PARKS / IMAGE RESTRICTED TO EDITORIAL USE - STRICTLY NO COMMERCIAL USE (Photo credit should read PETER PARKS/AFP/Getty Images)

Roger Federer of Switzerland hits a return against Rafael Nadal of Spain during the men's singles final on day 14 of the Australian Open tennis tournament in Melbourne on January 29, 2017. / AFP / PETER PARKS / IMAGE RESTRICTED TO EDITORIAL USE - STRICTLY NO COMMERCIAL USE        (Photo credit should read PETER PARKS/AFP/Getty Images)