Heart of a Champion: The Ray Mancini Story is a 1985 film directed by Richard Michaels. This is the story of boxer Ray ‘Boom Boom’ Mancini. Doug McKeon plays Mancini, while Robert Blake co-stars as his father, Lenny Mancini.

An excellent pugilist in his own right, Lenny’s career is cut short by his wartime service. Son Ray carries on the tradition into the 1980s, battling his way towards the WBA crown.

Heart of a Champion was executive produced by Sylvester Stallone, who staged the boxing sequences. This heartwarming ‘do it for the old man’ effort was first telecast May 1, 1985.

Summary via Wikipedia.