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Rafael Nadal of Spain serves to Hugo Dellien of Bolivia during their men's singles first round match at the Australian Open tennis championship in Melbourne, Australia on Jan. 21, 2020. (Xinhua/Wang Jingqiang)
Rafael Nadal of Spain serves to Hugo Dellien of Bolivia during their men's singles first round match at the Australian Open tennis championship in Melbourne, Australia on Jan. 21, 2020. (Xinhua/Wang Jingqiang)