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Novak Djokovic of Serbia celebrates after the men's singles quarterfinal match against Milos Raonic of Canada at the Australian Open tennis championship in Melbourne, Australia on Jan. 28, 2020. (Xinhua/Wang Jingqiang)
Novak Djokovic of Serbia celebrates after the men's singles quarterfinal match against Milos Raonic of Canada at the Australian Open tennis championship in Melbourne, Australia on Jan. 28, 2020. (Xinhua/Wang Jingqiang)