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(200129) -- MELBOURNE, Jan. 29, 2020 (Xinhua) -- Dominic Thiem (R) of Austria and Rafal Nadal of Spain acknowledge each other after the men's singles quarterfinal match between Rafal Nadal of Spain and Dominic Thiem of Austria at the Australian Open tennis championship in Melbourne, Australia on Jan. 29, 2020. (Xinhua/Zhu Wei)