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Stan Wawrinka of Switzerland serves during the singles second round match against Nicolas Jarry of Chile at the ATP Qatar Open Tennis match in Doha, capital of Qatar, Jan. 2, 2019. (Xinhua/Nikku)
Stan Wawrinka of Switzerland serves during the singles second round match against Nicolas Jarry of Chile at the ATP Qatar Open Tennis match in Doha, capital of Qatar, Jan. 2, 2019. (Xinhua/Nikku)