From 1952 to 1956, Rocky Marciano held the world Heavyweight title, stopping Light Heavy champ 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 Mayweather’s record and other past boxers’ unbeaten streaks into the 40s when beaten?
Super Brian Nielsen was 49-0 when he lost to Dicky 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 retiring.
Others still active are WBC, WBO, and WBC World Super Middle champ Terence ‘Bud’ Crawford, 42-0.
WBC World Light Heavyweight champion David Benavidez 30-0
Former 2-Division world champion Jermall ‘Hit Man’ Charlo 34-0
2-Division World champion Devin ‘The Dream’ Haney 32-0
Welterweight Brandun Lee 30-0
IBO World Super Lightweight champion Zhankosh ‘Da Kazakh Kid’ Turarov 29-0
WBO World Featherweight champ Rafael ‘El Divino’ Espinoza 27-0
WBA, WBC, WBO, IBF Super Bantam champ IBF, WBO, WBC World Super Bantamweight champion Naoya Inoue 31-0
IBF, WBC World Bantamweight champion Junto ‘Big Bang’ Nakitani 31-0
Last Updated on 10/08/2025