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