In 2017 Sagrera took part in his first national and continental karting competitions, with second place in the junior category of the Spanish Championship being his most notable achievement that year.

Sagrera made his single-seater debut with MOL Racing in the final round of the F4 Spanish Championship at the Circuit de Barcelona-Catalunya.

[1] Despite being a rookie, he managed to finish the third race in the top ten, although he did not receive points as he was classed as a guest driver.

[2] In 2020 the Spaniard returned to the Spanish Championship, this time racing the first four rounds of the season for MOL.

Sagrera stepped up to the GB3 Championship in 2021, partnering Ginetta Junior Champion Tom Lebbon and Mexican José Garfias at Elite Motorsport.