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Novak Djokovic of Serbia hits a return to Nishioka Yoshihito of Japan during their men's singles third round match at the 2020 Australian Open tennis tournament in Melbourne, Australia, Jan. 24, 2020. (Xinhua/Bai Xuefei)
Novak Djokovic of Serbia hits a return to Nishioka Yoshihito of Japan during their men's singles third round match at the 2020 Australian Open tennis tournament in Melbourne, Australia, Jan. 24, 2020. (Xinhua/Bai Xuefei)