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Dominic Thiem of Austria serves during the men's singles third round match between Dominic Thiem of Austria and Marin Cilic of Croatia at the 2019 Rogers Cup in Montreal, Canada, Aug. 8, 2019. (Xinhua/Andrew Soong)

Dominic Thiem of Austria serves during the men's singles third round match between Dominic Thiem of Austria and Marin Cilic of Croatia at the 2019 Rogers Cup in Montreal, Canada, Aug. 8, 2019. (Xinhua/Andrew Soong)