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Novak Djokovic (R) of Serbia greets Kei Nishikori of Japan after the men's singles quarterfinals match at 2019 Australian Open in Melbourne, Australia, Jan. 23, 2019. (Xinhua/Bai Xue)
Novak Djokovic (R) of Serbia greets Kei Nishikori of Japan after the men's singles quarterfinals match at 2019 Australian Open in Melbourne, Australia, Jan. 23, 2019. (Xinhua/Bai Xue)