Visitors stop to take a photo of a billboard featuring defending champion Serbia's Novak Djokovic ahead of the Australian Open at Melbourne Park in Melbourne, Australia, Tuesday, January 11, 2022. The prime ministers of Australia and Serbia have discussed Novak Djokovic's precarious visa after the top-ranked Serbian tennis star won a court battle to compete in the Australian Open but still faces the threat of deportation because he is not vaccinated against COVID-19. (Photo by Mark Baker/AP Photo)
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