Rocky Balboa is loosely based on this American former professional boxer who fought at heavyweight ans was born in what year
Chuck Wepner Charles "Chuck" Wepner (born February 26, 1939) is an American former professional boxer who fought at heavyweight. As a world ranked contender he fell just seconds short of a full fifteen rounds with world heavyweight champion Muhammad Ali in a 1975 title fight. Wepner also scored notable wins over Randy Neumann and Ernie Terrell.
Sean Mannion (boxer) Sean Mannion (born October 6, 1956 in Rosmuc, Ireland) is a former boxer in the light middleweight division. He boxed out of Massachusetts in the United States. His most notable bout was against Mike McCallum for the vacant WBA title, which he lost over a fifteen round unanimous decision. Newline Films reportedly plans to make a film about his life story. In January 2014, "Rocky Ros Muc: Seán Ó Mainnín", a biography about Mannion's life and career was released. The book is written in Irish but there are plans afoot to release an English version.