The 26-year-old Russian tennis player beat the owner of the courts Oscar Otte in two sets with a score of 7:6, 6:3 in the semifinal match.
The game lasted 1 hour 36 minutes.
Medvedev's next opponent will be the winner of the confrontation between Hubert Hurkacz (Poland) and Nick Kiryos (Australia).
The prize fund of the tournament is more than €2 million.
Earlier, State Duma deputy Svetlana Zhurova spoke about the return of Medvedev to the first line of the ATP rating.