Dominic Thiem came out on top in a high-quality match to beat Rafael Nadal at the ATP Finals.
The Austrian won 7-6 (9-7) 7-6 (7-4) for his second victory of the season-ending event at the O2 Arena in London.
Nadal had two set points in the first-set tie-break but could not convert with Thiem eventually securing victory on his fourth match point.
Stefanos Tsitsipas plays Andrey Rublev in Tuesday’s other match of Group London 2020 at about 20:00 GMT.
If defending champion Tsitsipas wins, Thiem will be into the semi-finals before his final match of the round-robin stage.
Nadal will play Rublev on Thursday while Thiem faces Tsitsipas in a repeat of last year’s final.
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