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Stefanos Tsitsipas of Greece hits a return during the singles group match against Andrey Rublev of Russia at the ATP World Tour Finals 2020 in London, Britain, on Nov. 17, 2020. (Xinhua/Han Yan)
Stefanos Tsitsipas of Greece hits a return during the singles group match against Andrey Rublev of Russia at the ATP World Tour Finals 2020 in London, Britain, on Nov. 17, 2020. (Xinhua/Han Yan)