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Canada's Milos Raonic serves against Luxembourg's Gilles Muller during their men's singles second round match on day four of the Australian Open tennis tournament in Melbourne on January 19, 2017. / AFP / SAEED KHAN / IMAGE RESTRICTED TO EDITORIAL USE - STRICTLY NO COMMERCIAL USE (Photo credit should read SAEED KHAN/AFP/Getty Images)

Canada's Milos Raonic serves against Luxembourg's Gilles Muller during their men's singles second round match on day four of the Australian Open tennis tournament in Melbourne on January 19, 2017. / AFP / SAEED KHAN / IMAGE RESTRICTED TO EDITORIAL USE - STRICTLY NO COMMERCIAL USE        (Photo credit should read SAEED KHAN/AFP/Getty Images)