Fioravanti competed in the 2016 US Open for surfing, pushing himself to compete despite injuries incurred during practice prior to the competition. He was eliminated in the contest, with indications that his injury contributed to his performance. He would go on to compete as the first surfer from Italy to perform at the inaugural Olympic surfing competition, replacing
Jordy Smith from South Africa, who dropped out due to an injury. Fioravanti made it to the second round of the competition. Fioravanti competed in his first stage of the CT in
2013 at the age of 16. In
2017 he reached the world elite for the first time, finishing 26th. In the
2021 season he achieved his best result yet, finishing 13th. The following year he got off to a bad start and ended up in the mid-season cut. But when he competed in the
2022 Challenger Series, he scored the most points, winning the EDP Vissla Pro Ericeira stage in Portugal and becoming CS 2022 champion and returning to the CT. In
2023, at the first stage of the season, he had his best result of his career, reaching the final of the
Billabong Pro Pipeline and being beaten by
Jack Robinson. Leo had his best finish of his career so far, coming 9th in the season and qualifying for the
Paris 2024 Olympics. In 2024 Leo took part in the
Olympic Games for the second time. He was eliminated by
Kanoa Igarashi in Round 2. At the
2024 CT he came 22nd place. In
2025 CT he started the season by reaching the final of the Pipe Pro for the second time in his career and again lost to the defending champion from the 2024 event,
Barron Mamiya. ==Career Victories ==