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Serbia's Novak Djokovic (R) congratulates Uzbekistan's Denis Istomin's victory in 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 via Getty Images)

Serbia's Novak Djokovic (R) congratulates Uzbekistan's Denis Istomin's victory in 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 via Getty Images)
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AFP SAEED KHAN