Stefano Coletti secured victory in the GP2 sprint race around the streets of Monte Carlo.
Coletti's win was the first home win for a Monegasque driver in either Formula 1 or its main support series since 1931.
Championship leader Coletti jumped up from third on the grid to slot in behind pole sitter Adrian Quaife Hobbs on the run up Beau Rivage.
The Rapax driver pulled off a bold move into the Nouvelle Chicane on lap three to take the lead, one which he never relinquished.
Quaife-Hobbs hung onto second place to give new team MP Motorsport their first podium finish in GP2.
Mitch Evans made a fine start from sixth on the grid and completed an audacious move on James Calado on the opening lap to move into third place.
After initially challenging Quaife-Hobbs for second, Evans had to go on the defensive to secure his second podium of the weekend.
Calado subsequently lost fourth place to Carlin's Felipe Nasr after the Brazilian overtook him on the run to Sainte Devote.
Front row starter Rene Binder slipped to sixth place, ahead of feature race runner-up Kevin Ceccon.
Stephane Richelmi's eighth place meant there were two home drivers in the points.
Feature race winner Sam Bird struggled with his tyres and came home in 24th, ahead only of team-mate Tom Dillmann, who was three laps down after contact.
All 25 starters finished the race.