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Novak Djokovic of Serbia celebrates during the men's singles final against Dominic Thiem of Austria at 2020 Australian Open in Melbourne, Australia on Feb. 2, 2020. (Xinhua/Zhu Wei)

Novak Djokovic of Serbia celebrates during the men's singles final against Dominic Thiem of Austria at 2020 Australian Open in Melbourne, Australia on Feb. 2, 2020. (Xinhua/Zhu Wei)