37. Carlos Monzon
Division: Middleweight (160)
Years Active: 1963-1977
Before there was Sergio Martinez, there was Carlos Monzon. Probably the greatest middleweight of all time, the handsome Argentine had a seven-year reign as world middleweight champion during which he made 14 consecutive defenses.
As a young, unpolished boxer, he lost his ninth, 14th and 20th pro bouts in his native Argentina but then embarked on an 81-bout unbeaten streak—among the longest ever—to finish his career. He did it against quality opponents: He twice beat all-time greats Jose Napoles, Emile Griffith and Nino Benvenuti, and he also had a win against Bennie Briscoe.
However, the co-winner of 1972’s Ring Fighter of the Year award began to have problems in his personal life. He was shot in the leg by his wife in 1973, and soon thereafter, domestic violence reports became common for Monzon. He was convicted of murdering his second wife, Alicia Munoz, in 1989 and imprisoned. He then died in a car crash on a weekend furlough in 1999, leaving behind a fractured legacy.
(source: bleacherreport.com by Dave Carlson)