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Dominic Thiem (Bottom) of Austria competes with 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/Bai Xuefei)

Dominic Thiem (Bottom) of Austria competes with 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/Bai Xuefei)