Men&#39;s world number one tennis player Novak Djokovic of Serbia gestures from his hotel balcony on the last day of his two-week quarantine in Adelaide on January 28, 2021, one of the locations where players have quarantined upon their arrival ahead of the Australian Open tennis tournament in Melbourne. (Photo by Brenton EDWARDS / AFP) / -- IMAGE RESTRICTED TO EDITORIAL USE - STRICTLY NO COMMERCIAL USE -- (Photo by BRENTON EDWARDS/AFP via Getty Images)