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Novak Djokovic of Serbia reacts during the men's singles 4th round match against Diego Schwartzman of Argentina at the Australian Open tennis championship in Melbourne, Australia on Jan. 26, 2020. (Xinhua/Zhu Wei)
Novak Djokovic of Serbia reacts during the men's singles 4th round match against Diego Schwartzman of Argentina at the Australian Open tennis championship in Melbourne, Australia on Jan. 26, 2020. (Xinhua/Zhu Wei)