It is the Alpine Academy member's first win with ART Grand Prix, who he joined from MP Motorsport this season, and marked a change in his fortunes after a forced retirement in the sprint race.
Martins overtook polesitter Franco Colapinto - starting at the front in his and Van Amersfoort Racing's first FIA F3 weekend - to secure the lead, and built enough of an advantage to ensure he was well protected from a late-race charge from Leclerc.
