Castagna is four times Italian Champion, winning the
Italian Individual Speedway Championship in 2017, 2018, 2022 and 2024. He has also won the Italian Junior Championship three times (2011, 2012, 2014). riding for various clubs, including Ipswich Witches in 2016. In 2019 and 2021 he rode for the
Birmingham Brummies. In 2022, he rode for the
Edinburgh Monarchs in the
SGB Championship 2022. He won his third
Italian Individual Speedway Championship during 2022. In 2023 and 2024, he re-signed for the Monarchs for the
SGB Championship 2023 and the
SGB Championship 2024. In 2025, he was awarded
Medaglia al valore atletico in his home province of Vicenza in recognition of his achievement in the 2024 Italian Individual Speedway Championship, where he completed the entire series completely unbeaten by an opponent. Castagna returned to race for Birmingham for the third time during the early part of the
2025 Premiership season. == Results ==