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Novak Djokovic of Serbia celebrates while competing against Rafael Nadal of Spain during the ATP Cup final between Spain and Serbia in Sydney, Australia, Jan. 12, 2020. (Xinhua/Bai Xuefei)
Novak Djokovic of Serbia celebrates while competing against Rafael Nadal of Spain during the ATP Cup final between Spain and Serbia in Sydney, Australia, Jan. 12, 2020. (Xinhua/Bai Xuefei)