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Juan Ignacio Londero of Agentina reacts during the men's singles first round match against Grigor Dimitrov of Bulgaria at the Australian Open tennis championship in Melbourne, Australia on Jan. 20, 2020. (Xinhua/Bai Xuefei)

Juan Ignacio Londero of Agentina reacts during the men's singles first round match against Grigor Dimitrov of Bulgaria at the Australian Open tennis championship in Melbourne, Australia on Jan. 20, 2020. (Xinhua/Bai Xuefei)