Born in Toronto, Canada, Mazzaferro is of Italian descent through his grandparents.[1] Mazzaferro began playing youth soccer with Bolton SC.[2] After his family moved to London, Ontario, he began playing with FC London, later moving on to play with Brampton SC and Atletico Toronto.[2] He later joined the Toronto FC Academy.[3]
College career
In 2019, he began attending the University of South Florida, where he played for the men's soccer team.[4] On August 29, 2019, he made his collegiate debut in a match against the Maryland Terrapins.[5] At the end of his freshman season, he was named to the American Athletic Conference (AAC) All-Rookie Team and the All-Academic Team.[6][7] On March 6, 2021, he recorded his first assist, in a match against the Tulsa Golden Hurricane.[8] On March 20, 2021, he scored his first collegiate goal, in a match against the SMU Mustangs.[9] After his sophomore season, he was named to the All-AAC Second Team and was once again named to the All-Academic Team.[10][11] Ahead of his junior season, he was named to the preseason All-Conference team,[12] and after the season, he was once again named an All-AAC Second Team.[13]
Ahead of his senior season, he was once again named to the preseason All-AAC team[14] and was named the AAC Defensive Player of the Week in October.[15] At the end of the season, he was named to the All-AAC Second Team for the third time, and was also named to the All-East Region Third Team.[16][17]
In December 2022, Mazzaferro was selected in the third round (72nd overall) of the 2023 MLS SuperDraft by Austin FC.[20][21] In March 2023, he signed a professional contract with their second team Austin FC II, in MLS Next Pro.[22] On June 18, 2023, he scored his first goal in a 4-0 victory over Portland Timbers 2.[23] He won the MLS Next Pro title with the club in 2023.[24] After appearing in 27 matches during the 2023 season, Austin FC II exercised the one year option on Mazzaferro's contract for the 2024 season.[25]
During Austin FC's 2024 season, the first team signed Mazzaferro to a short term loan from March 2 to March 5.[26]