Defending champion Daniil Medvedev beat 2018 champion Alexander Zverev on Tuesday to reach the ATP Finals semi-finals to register two of two wins in Turin.
Medvedev, who won the US Open for his first Grand Slam title in September, took more than 2 1/2 hours to beat Zverev 6-3, 6-7(3), 7-6(6) and with the German Equaled. On tour-leading 56 wins.
He leads the Red Group and a place in the last four would be guaranteed if first-time qualifier Hubert Herkás beat local favorite Matteo Berrettini after Tuesday.
Berrettini retired with an apparent abdominal injury against Zverev on Sunday and, if he is not fit enough, could be replaced by another Italian Jannik Sinner, who is a first option.
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Sharp conditions inside Pala Alpitore helped, with Medvedev scoring 14 aces and Zverev scoring 18.
Medvedev was in a conflict from the start, suffering three break points in his opening two service games, but breaking Zverev to take a 3–0 lead. The world number two won the opening set with a brilliant backhand.
The victory in the second set saw good timing as Medvedev dropped only two points in his first five service games. But Zverev held on and saved three break points to force a tiebreaker which the German won.
In the deciding set, Medvedev had to save a break point to prevent Zverev from serving for the match, and won the tiebreaker on his third match point when Zverev netted a backhand.