Kevin Harkin played in Wakefield Trinity's 11–22 defeat by Halifax in the 1971–72 Players No.6 Trophy Final during the 1971–72 season at Odsal Stadium, Bradford on Saturday 22 January 1972, in front of a crowd of 7,975, and played as an interchange/substitute (replacing Tony Dean) in Hull FC's 12–4 victory over Hull Kingston Rovers in the 1981–82 John Player Trophy Final during the 1981–82 season at Headingley Rugby Stadium, Leeds on Saturday 23 January 1982.
