Marvelous Marvin Hagler (born Marvin Nathaniel Hagler; May 23, 1954) is an American former professional boxer who was Undisputed World Middleweight Champion from 1980 to 1987. Hagler made twelve undisputed title defenses and holds the highest KO% of all undisputed middleweight champions at 78%. At six years and seven months, his reign as undisputed middleweight champion is the second longest of the [&hellip
Marvelous Marvin Hagler (born Marvin Nathaniel Hagler; May 23, 1954) is an American former professional boxer who was Undisputed World Middleweight Champion from 1980 to 1987. Hagler made twelve undisputed title defenses and holds the highest KO% of all undisputed middleweight champions at 78%. At six years and seven months, his reign as undisputed middleweight champion is the second longest of the [&hellip