From 1952 to 1956, Rocky Marciano held the world heavyweight title, stopping light heavyweight champion Archie “Old Mongoose” Moore, 149-19-8, in his final fight.
In 2017, multi-division champion Floyd “Pretty Boy” Mayweather Jr. retired after improving his record to 50-0, defeating Conor McGregor 0-0.
Who is now chasing the record held by Mayweather and other former boxers who went undefeated until their 40s when they were beaten?
Super Brian Nielsen was 49-0 when he lost to Dickie Ryan.
Heavyweight champion Larry “The Easton Assassin” Holmes was 48-0 when he lost to Michael Spinks.
Undisputed super middleweight champion Joe Calzaghe, 46-0, upon his retirement.
Others still active are WBC, WBO, and WBC World Super Middleweight Champion Terence ‘Bud’ Crawford, 42-0.
WBC World Light Heavyweight Champion David Benavidez 30-0
Former Division II World Champion Jermall “Hitman” Charlo 34-0
2-Division Two World Champion Devin “The Dream” Haney 32-0
Welfare Brandon Lee 30-0
IBO Super Lightweight World Champion Zhankosh ‘Da Kazakh Kid’ Turtov 29-0
WBO featherweight world champion Rafael “El Divino” Espinosa 27-0
WBA, WBC, WBO, IBF Super Bantamweight Champion IBF, WBO, WBC World Super Bantamweight Champion Naoya Inoue 31-0
International Boxing Federation, WBC bantamweight world champion Junto “Big Bang” Nakitani 31-0
Last updated on 08/10/2025
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