The ART rookie and reigning F3 champion started on pole and though he briefly lost the lead to Ayumu Iwasa (DAMS) on lap one, reclaimed the lead quickly, though he was later penalised for gaining an advantage off-track.
Despite three safety cars and the five-second penalty, which he was handed after his pitstop, the Alpine Academy member managed to clear a seven-second gap to second-placed Hitech driver Zane Maloney to hold onto the win.
His team-mate, Theo Pourchaire, finished third to close the gap in the championship to Prema driver Frederik Vesti to just six points, with the Dane failing to finish after a safety car restart crash early on.
Iwasa led into Turn 1 after a fantastic launch before Martin fought back, running wide at the Loop and incurring a penalty in the process.
Behind, Oliver Bearman (Prema) slotted into third, having started fifth, as second-place start Kush Maini fell back to sixth.
Martins built a three-second lead to Iwasa by lap three, with a further 1.1s to Bearman, while further back Jack Doohan (Virtuosi) took fourth from Hitech’s Enzo Fittipaldi round the outside of Stowe.
The first pitstops came on lap six, with Fittipaldi, Vesti, Roy Nissany (PHM), Hitech’s Jak Crawford and VAR driver Richard Verschoor first to pit.
Source: Autosport