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Dominic Thiem of Austria serves during the singles quarterfinal match against Stefanos Tsitsipas of Greece at the ATP Qatar Open in Doha, Qatar, on Jan. 4, 2018. Dominic Thiem won 2-0. (Xinhua/Nikku)
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Dominic Thiem of Austria serves during the singles quarterfinal match against Stefanos Tsitsipas of Greece at the ATP Qatar Open in Doha, Qatar, on Jan. 4, 2018. Dominic Thiem won 2-0. (Xinhua/Nikku)