Billy Monger took his first single-seater victory by gambling on wet tyres in the Pau Grand Prix Euroformula Open race.
The 20-year-old's Carlin-run car is specially adapted for him to use after the amputation of both his legs below the knees as a result of a British Formula 4 crash two years ago.
Monger had qualified 11th but peeled into the pits at the end of the warm-up lap to switch from slick to wet tyres after rain started to fall on the grid.
As he made his way up the order, the dominant Motopark team fought over the top four positions, led by surprise poleman Julian Hanses.
Hansas held on to the lead for 14 laps, until Red Bull-backed team-mate Liam Lawson made a failed move on the German through the twisty Turn 10/11 sweep.
Although Lawson - who qualified fourth after winning the first race of the weekend - was faster than his team-mates, Motopark's choice to keep its drivers on slick tyres meant Monger was rapidly closing on them.
He was just a second behind when the clash between Hanses and Lawson took place, and after holding off Carlin team-mate Nicolai Kjaergaard on a safety car restart to clear the crashed cars, Monger pulled away up front to win by 1.121 seconds.
Lawson's fellow Red Bull junior and Motopark team-mate Yuki Tsunoda switched to wets after his team-mates clashed, having already been overtaken by Monger, and used his fresh rubber advantage to close onto the back of the top two as the race ended.
But Monger and Kjaergaard were able to stay clear of Tsunoda to complete the Carlin one-two.
Monger had returned to single-seater racing with Carlin in BRDC British Formula 3 last season, where he was a podium finisher from the opening event and finished sixth in the championship.
He initially attempted to get into the new FIA F3 Championship for 2019 before opting for Euroformula Open, which uses previous generation F3 machinery.