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Karen Khachanov of Russia serves during the singles first round match against Stan Wawrinka of Switzerland at the ATP Qatar Open Tennis match in Doha, capital of Qatar, Jan. 1, 2019. (Xinhua/Nikku)
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Karen Khachanov of Russia serves during the singles first round match against Stan Wawrinka of Switzerland at the ATP Qatar Open Tennis match in Doha, capital of Qatar, Jan. 1, 2019. (Xinhua/Nikku)