No. 4 seed Andrey Rublev of Russia was tested by Georgia's Nikoloz Basilashvili but advanced with a 6-1, 3-6, 6-3 victory on Saturday to reach the final of the Noventi Open in Halle, Germany.
It's the first grass-court final for Rublev, who has won four straight ATP 500-level finals.
Rublev will face France's Ugo Humbert, who outlasted Canada's Felix Auger-Aliassime 6-4, 3-6, 7-6 (5) in the other semifinal.
Top-seeded Matteo Berrettini of Italy finished with eight aces and eliminated No. 4 seed Alex de Minaur of Australia 6-4, 6-4 to reach the final at the Queen's Club in London.
Berrettini, playing the event for the first time, will face unseeded Cameron Norrie of Great Britain in the final. The 25-year-old Berrettini is now 25-6 on the season.
Norrie stunned No. 2 seed Denis Shapovalov of Canada 7-5, 6-3 to advance.
--Field Level Media