ATP Finals: Nadal fights back, Tsitsipas in semis
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Stefanos Tsitsipas entered the semifinals of the ATP Finals, while Rafael Nadal delivered a brilliant comeback to boost his hopes. 21-year-old Tsitsipas dominated throughout over defending champion Alexander Zverev in a 6-3 6-2 win. Earlier, Nadal roared back from 5-1 down and saved a match point to beat Daniil Medvedev 6-7 (3-7) 6-3 7-6 (7-4). The Spaniard now has to beat Tsitsipas to have a chance of advancing.