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Alex Bolt of Australia hits a return to Dominic Thiem of Austria during their men's singles second round match at the Australian Open tennis championship in Melbourne, Australia on Jan. 23, 2020. (Xinhua/Zhu Wei)

Alex Bolt of Australia hits a return to Dominic Thiem of Austria during their men's singles second round match at the Australian Open tennis championship in Melbourne, Australia on Jan. 23, 2020. (Xinhua/Zhu Wei)