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Novak Djokovic of Serbia serves during the men's singles third round match against Denis Shapovalov of Canada at 2019 Australian Open in Melbourne, Australia, Jan. 19, 2019. (Xinhua/Lui Siu Wai)
Novak Djokovic of Serbia serves during the men's singles third round match against Denis Shapovalov of Canada at 2019 Australian Open in Melbourne, Australia, Jan. 19, 2019. (Xinhua/Lui Siu Wai)