What Jamaican boxer won against the author of "Rocky Ros Muc: Seán Ó Mainnín"?
Sean Mannion (boxer):  In January 2014, "Rocky Ros Muc: Seán Ó Mainnín", a biography about Mannion's life and career was released. Mike McCallum: Mike McCallum (born 7 December 1956) is a Jamaican former professional boxer who competed from 1981 to 1997.
Mike McCallum