Isack Hadjar made his single-seater debut in the 2019 French F4 Championship. He achieved a race win in Spa and scored a further podium and finished the season in 7th place. Crawford remained in the series in 2020 and with 11 podiums including 3 wins he finished the season in 3rd place. 

In 2021, Hadjar moved to the Formula Regional European Championship and scored 5 podiums including 2 wins which let him finish the season in 5th place. In 2022, Hadjar contested in both the Formula Regional European Championship and the FIA Formula 3 Championship. He scored 5 podiums including 2 wins in the former and 5 podiums including 3 wins in the latter. For the 2023 season, the Frenchman is set to move into Formula 2 to drive for Hitech Grand Prix.