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Stefanos Tsitsipas of Greece celebrates during the singles group match against Alexander Zverev of Germany at the ATP World Tour Finals 2019 in London, Britain on Nov. 13, 2019. (Xinhua/Han Yan)
Stefanos Tsitsipas of Greece celebrates during the singles group match against Alexander Zverev of Germany at the ATP World Tour Finals 2019 in London, Britain on Nov. 13, 2019. (Xinhua/Han Yan)