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Novak Djokovic of Serbia serves during the men's singles second round match against Gael Monfils of France at Australian Open 2018 in Melbourne, Australia, Jan. 18, 2018. Novak Djokovic won 3-1. (Xinhua/Bai Xuefei)
Novak Djokovic of Serbia serves during the men's singles second round match against Gael Monfils of France at Australian Open 2018 in Melbourne, Australia, Jan. 18, 2018. Novak Djokovic won 3-1. (Xinhua/Bai Xuefei)