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Novak Djokovic of Serbia celebrates winning 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/Bai Xue)
Novak Djokovic of Serbia celebrates winning 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/Bai Xue)