Boxing has produced many champions with long winning streaks, but very few retire without a loss. Two of the sport’s most famous unbeaten careers belong to Rocky Marciano and Floyd Mayweather Jr., whose perfect records continue to be used as benchmarks whenever another fighter begins approaching 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 unbeaten 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 scored 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 matching those perfect records before suffering their first defeat late in their careers. Heavyweight champion Larry Holmes entered his September 1985 title defense with a 48-0 record before losing a decision to former light heavyweight champion and 1976 Olympic gold medalist Michael Spinks.
Brazilian legend Éder Jofre also carried an extended unbeaten run before his first loss. Jofre entered his 1965 bantamweight title fight with a record of 47-0-3 before losing a split decision to Japan’s Fighting Harada.
Other champions managed to complete their careers without a defeat. Welsh great Joe Calzaghe retired in November 2008 with a record of 46-0 (32 KOs) following victories over Roy Jones Jr. and Bernard Hopkins during the final stage of his career. Earlier in his championship run, Calzaghe also defeated Denmark’s Mikkel Kessler in a unification fight at super middleweight.
Long unbeaten stretches have appeared throughout boxing history. According to The Ultimate Encyclopedia of Boxing by historian Harry Mullan, notable extended unbeaten runs include Packey McFarland (97 fights), Fred Dyer (94 fights), Pedro Carrasco (93 fights), Sugar Ray Robinson (91 fights) and Julio César Chávez Sr. (90 fights).
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 unbeaten remains one of the rarest accomplishments.
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Boxing News 24 » Floyd Mayweather Jr » Rocky Marciano’s 49-0 and Floyd Mayweather’s 50-0 among boxing’s rare perfect careers
Last Updated on 2026/03/14 at 3:08 PM
