Marvin Hagler Signed Glove comes professionally framed with a certificate of authenticity on the back. Marvelous Marvin Hagler was an American professional boxer and film actor. He competed in boxing from 1973 to 1987 and reigned as the undisputed champion of the middleweight division from 1980 to 1987, making twelve successful title defences, all but one by knockout. Hagler also holds the highest knockout percentage of all undisputed middleweight champions at 78 percent. His undisputed middleweight championship reign of six years and seven months is the second-longest active reign of the last century. He holds the record for the sixth longest reign as champion in middleweight history.