Boxing has produced many champions with long winning streaks, but very few retire without a loss. Two of the sport’s most famous undefeated careers belong to Rocky Marciano and Floyd Mayweather Jr., whose perfect records are still used as benchmarks when another fighter begins to approach an undefeated finish.
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Marciano retired in September 1955 with a record of 49-0 (43 KOs) after defeating Archie Moore to retain the heavyweight championship. His mark became one of boxing’s most celebrated records and stood for decades as the standard for an undefeated career at the top level.
Mayweather later surpassed that total, finishing his professional career at 50-0 (27 KOs) following his victory over Conor McGregor in August 2017. Two years earlier, Mayweather had already achieved one of the sport’s most lucrative victories when he defeated Manny Pacquiao by unanimous decision in May 2015.
Several other champions came close to those perfect records before suffering their first loss late in their careers. Heavyweight champion Larry Holmes entered his title defense in September 1985 with a 48-0 record before losing a decision to former lightweight champion and 1976 Olympic gold medalist Michael Spinks.
Brazilian legend Éder Jofre also went on a long unbeaten run before his first loss. Jofre entered his 1965 bantamweight title fight with a 47-0-3 record before losing a split decision to Japan’s Fighting Harada.
Other champions have managed to finish their careers without a defeat. Welsh great Joe Calzaghe retired in November 2008 with a record of 46-0 (32 KO’s) following victories over Roy Jones Jr. and Bernard Hopkins in the last phase of his career. Earlier in his championship run, Calzaghe also defeated Denmark’s Mikkel Kessler in a super middleweight unification bout.
Long undefeated streaks have appeared throughout boxing history. According to The Ultimate Encyclopedia of Boxing by historian Harry Mullan, notable extended undefeated streaks include Packey McFarland (97 fights), Fred Dyer (94 fights), Pedro Carrasco (93 fights), Sugar Ray Robinson (91 fights) and Julio César Chávez Sr. (90 battles) in.
Marciano’s 49-0 and Mayweather’s 50-0 remain the most recognizable perfect records in boxing history. In a sport where even great champions often suffer defeats during long careers, retiring undefeated remains one of the rarest of achievements.
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Last updated on 2026/03/14 at 15:08
