Mahony first played hurling to a high standard as a student at De La Salle College in Waterford.
He lined out in all grades, including the Dr Harty Cup.
He eventually progressed to adult level and, after a year with the intermediate team, he won his first Waterford SHC medal in 2020.
[5] Mahony made his senior team debut during the 2023 National Hurling League.
[6] His uncles, Billy, Darragh and Shane O'Sullivan, as well as his brothers, Philip and Pauric Mahony, have also played with Ballygunner and the Waterford senior team.