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Novak Djokovic of Serbia hits a return the men's singles final match between Novak Djokovic of Serbia and Rafael Nadal of Spain at 2019 Australian Open in Melbourne, Australia, Jan. 27, 2019. (Xinhua/Lui Siu Wai)
Novak Djokovic of Serbia hits a return the men's singles final match between Novak Djokovic of Serbia and Rafael Nadal of Spain at 2019 Australian Open in Melbourne, Australia, Jan. 27, 2019. (Xinhua/Lui Siu Wai)