Totally overwhelmed in the first round, Sinner regained confidence from the start of the second and pushed the Russian to fight much more than he had imagined in view of the course of the game so far.
Medvedev, winner of the tournament last year, will face Saturday in the semi-finals the 2nd of the Green group which will be determined on Friday after the match between his compatriot Andrey Rublev (5th) and the Norwegian Casper Ruud (8th).
Sinner replaced since Tuesday the withdrawal of his Italian compatriot Matteo Berrettini (7th), injured.
© 2021 AFP