He won a Kilkenny JHC medal in 1956 following a 6-09 to 4-06 defeat of St Finbarr's, Castleinch in the final.
He won a Leinster JHC medal before later lining out in Kilkenny's 5-02 to 2-08 defeat of London in the 1956 All-Ireland junior final.
[3][4] Fleming made his senior team debut in a National Hurling League game against Waterford in March 1956.
He was later dropped from the team but recalled in October 1957 and won back-to-back Leinster SHC medals in 1958 and 1959.
[5] Fleming lined out at centre-forward when Kilkenny were beaten by Waterford in the 1959 All-Ireland final replay.