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Novak Djokovic of Serbia serves during the men's singles fourth round match against Chung Hyeon of South Korea at Australian Open 2018 in Melbourne, Australia, Jan. 22, 2018. Djokovic lost by 0-3. (Xinhua/Li Peng)
Novak Djokovic of Serbia serves during the men's singles fourth round match against Chung Hyeon of South Korea at Australian Open 2018 in Melbourne, Australia, Jan. 22, 2018. Djokovic lost by 0-3. (Xinhua/Li Peng)