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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ATP World Tour Finals 2019 Results: Tsitsipas vs. Thiem Final Set After Semis, News, Scores, Highlights, Stats, and Rumors