Former four-division world champion Floyd ‘Money’ Mayweather, 50-0, defeated former heavyweight champion Rocky Marciano, 49-0, in August 2017, stopping MMA champion Connor McGregor, making his debut in boxed in ten rounds. Some people think that a * should be in addition to his 50-0 record, and I am one of them.
Some retired undefeated, and others undefeated with a draw or two. WBO Super Middleweight champion Joe Calzaghe, 46-0 from Wales, retired due to bad hands. He came to the United States and defeated Bernard ‘The Executioner’ Hopkins and Roy Jones, Jr., ending his career.
Ricardo “Finito” Lopez, Jr., 51-0-1, was WBA Mini and IBF lightweight Flyweight champion after drawing with Rosendo Alvarez, won the rematch. It was 47-0 when they tied.
Jimmy ‘Little Tiger’ Barry, 59-0-10, world bantamweight champion, draws in his last eight fights.
Italian EBU champion Nino LaRocca, 74-6, was 56-0 when he lost.
Thailand’s WBC Mini World Champion Chayaphon Moonsri, 55-3, was 54-0 when he lost.
Heavyweight champion Larry, “The Assassin of Easton”, was 48-0 when he lost to Olympic champion and then lightweight champion Michael Spinks.
“Super” Brian Nielsen, 64-3, from Denmark, was 49-0 when he lost to Dicky Ryan, winning the rematch.
Lee Sala was 48-0 when he lost to Tony DeMicco, winning the rematch.
Thailand’s Tasama Salapat, 76-2 with 53 knockouts, was 48-0 when he lost to Takuma Inoue.
IBF Lightweight champion Paul ‘The Pittsburgh Kid’ Spadafora was 49-1-1 and 48-0-1 when he lost to Johan Perez.
Heavyweight champion Deontay, “The Bronze Bomber” Wilder, was 42-0-1 when he lost to Tyson Fury.
Former super middleweight and cruiserweight champion Gilberto ‘El Zurdo’ Ramirez, 46-1, was 44-0 when he lost to Dimitrii Bivol.
Mexican three-division world champion Julio ‘JC’ Cesar Chavez, 107-6-2, was 89-0-1 when he lost to Frankie ‘The Surgeon’ Randall, winning the rematch.
Light Welterweight champion Aaron ‘Hawk’ Pryor, 39-1, was 36-0 when he returned after a two-year loss to Bobby Joe Young.
Denmark’s Tom Boggs, 77-8-1, was 53-0-1 when he lost to Emile Griffith.
Brazil’s two-division world champion Eder Jofre, 72-2-4, was 47-0-3 when he lost to Fighting Harada.
Poland’s 48-2 two-division world champion Dariusz Michalczewski was 48-0 when he lost to Julio Cesar Gonzalez.
World featherweight champion Willie ‘Will o’ the Wisp’ Pep, 229-11-1, was 62-0 when he lost to Sammy Angott.
Jaime Munguia, 44-1, the former Mexican WBO middleweight champion, was 43-0 when he lost to Saul ‘Canelo’ Alvarez.
Two-division world champion “Sugar” Ray Robinson, 174-19-6, was 40-0 when he lost to Jake LaMotta. He beat La Motta four times during their career.
Light and heavyweight champion Gene “The Fighting Marine” Tunney, 80-1-3, was 47-0-2 when he lost to Harry Greb.
Russian heavyweight champion Nikolai “The Russian Giant” Valuev, 50-2, was 46-0 when he lost to Ruslan Chagaev.
Italy’s Nino Benvenutti, a two-division world champion, 82-7-1, was 65-0 when he lost to Ki Soo Kim.
I’m sure readers will come up with other names.
