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A supporters of Serbia's Novak Djokovic holds sign that reads: "Nole (Novak)'' during a protest in Belgrade, Serbia, Saturday, Jan. 8, 2022. The No. 1-ranked Djokovic was denied entry at the Melbourne airport late Wednesday after border officials canceled his visa for failing to meet its entry requirement that all non-citizens be fully vaccinated for COVID-19. (AP Photo/Darko Vojinovic)