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Novak Djokovic of Serbia celebrates during the men's singles second round match against Ito Tatsuma of Japan at the 2020 Australian Open tennis tournament in Melbourne, Australia, Jan. 22, 2020. (Xinhua/Zhu Wei)
Novak Djokovic of Serbia celebrates during the men's singles second round match against Ito Tatsuma of Japan at the 2020 Australian Open tennis tournament in Melbourne, Australia, Jan. 22, 2020. (Xinhua/Zhu Wei)