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Alex Bolt of Australia serves 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 serves 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)