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

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