[1][2] A three-time national karting champion having begun his career at the age of eight, Zagazeta quickly switched to international competition, primarily in America.

[4][5] After testing Formula 4 machinery for the first time in late 2019, Zagazeta signed with British F4 giants Carlin for his single-seater debut the following year.

[9] Switching to Phinsys by Argenti for his second British F4 campaign,[10] Zagazeta's results improved drastically, as he got a maiden single-seater podium in the season opener at Thruxton.

[20] Zagazeta took part in the FIA Formula 3 post-season test in 2022, driving for Charouz Racing System during the final two days.

[26] Zagazeta remained in Formula 3 for 2025, but switched to new entrants DAMS Lucas Oil as Jenzer Motorsport departed the championship.