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Novak Djokovic of Serbia attends the press conference ahead of Australian Open 2018 in Melbourne, Australia, Jan. 13, 2018. (Xinhua/Bai Xuefei)
Novak Djokovic of Serbia attends the press conference ahead of Australian Open 2018 in Melbourne, Australia, Jan. 13, 2018. (Xinhua/Bai Xuefei)