He previously competed in the FIA World Endurance Championship for Akkodis ASP Team in the Lexus RC F GT3 alongside José María López and Takeshi Kimura.

[1] He started winning titles after moving to France, with regional and national championships in the categories mini-kart, Minimes and Cadets.

[6] The Frenchman started his campaign out in brilliant fashion, winning the opening race at Nogaro and taking an early championship lead after three successive victories, two in Magny-Cours and one at the Hungaroring.

[11][12][13] For the 2022 season Masson progressed to the Formula Regional European Championship as one of the French Federation of Automobile Sport's five Équipe de France representatives.

[14] He joined two-time Formula One World Champion Fernando Alonso's team, FA Racing, alongside Victor Bernier and Nicolás Baptiste.

[15][16] At the Circuit Zandvoort Masson collided with Pietro Delli Guanti approaching turn two, sending the Italian into a roll.

[17] Before the round at Spa-Francorchamps, it was announced that Masson would switch to ART Grand Prix, replacing Mari Boya.

For 2024, Masson pivoted to the World Endurance Championship on a full-time basis, joining Akkodis ASP Team in the LMGT3 category alongside José María López and Takeshi Kimura.