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Novak Djokovic of Serbia reacts during the men's singles quarterfinal match against Milos Raonic of Canada at the Australian Open tennis championship in Melbourne, Australia on Jan. 28, 2020. (Xinhua/Bai Xuefei)
Novak Djokovic of Serbia reacts during the men's singles quarterfinal match against Milos Raonic of Canada at the Australian Open tennis championship in Melbourne, Australia on Jan. 28, 2020. (Xinhua/Bai Xuefei)