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Florian Mayer of Germany hits a return during the singles first round match against Stefanos Tsitsipas of Greece at the ATP Qatar Open in Doha, Qatar, Jan. 1, 2018. Tsitsipas won 2-1. (Xinhua/Nikku)
Florian Mayer of Germany hits a return during the singles first round match against Stefanos Tsitsipas of Greece at the ATP Qatar Open in Doha, Qatar, Jan. 1, 2018. Tsitsipas won 2-1. (Xinhua/Nikku)