Pepe Marti made his single-seater debut in 2021 contesting in the Formula 4 UAE Championship. He achieved 4 podiums including 1 win and finished the year in 7th. Also in 2021, Marti contested in the F4 Spanish Championship where he scored 9 podiums including 2 wins and finished the year in 3rd place. 

In 2022, Marti made the step up to the FIA Formula 3 Championship with Campos Racing. He had a tough debut F3 season but during the final round of the season in Monza, he scored his first points of the season and finished the year in 26th place. For the 2023 season, Marti is set to continue the season with Campos racing.