Thiem victorious in ATP Finals opener, beats Tsitsipas in rematch

Dominic Thiem outlasted Stefanos Tsitsipas in a rematch of the 2019 final, beating the defending champion 7-6 (5), 4-6, 6-3 Sunday in the opening singles match at the ATP Finals inside a largely empty O2 Arena in London, England.

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Stefanos Tsitsipas wins ATP Finals title: Greek defeats Dominic Thiem in three sets at The O2, London Evening Standard

Tight and nervous,' Thiem tops No. 1 Djokovic at ATP Finals

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Stefanos Tsitsipas Lands 39 Straight First Serves In Comeback Win vs. Dominic Thiem, ATP Tour

ATP Finals 2020 results: Dominic Thiem wins three-set battle against Stefanos Tsitsipas