Rocky Marciano held the record of 49-0 for some time. Many suffered their first loss trying to equal it or when they passed it.
Denmark’s Brian Nielsen actually equaled it at 49-0 losing in his own country to American Dicky Ryan. Then there was Larry Holmes at 48-0 losing to Michael Spinks. Nikolai Valuev was 46-0 when he lost to Ruslan Chagaev. “Sugar” Ray Robinson was 40-0 when he lost to Jake LaMotta. Eder Jofre was 47-0-3 when he lost to Fighting Harada. Alberto Cortes was 44-0 when he lost to Julio Cesar Chavez. Ruben Castillo was 44-0 when he lost to Alexis Arguello. Damian Jonak was 41-0-1 when he lost to Andrew Robinson. Deontay “The Bronze Bomber” Wilder was 42-0-1 when he lost to Tyson Fury. Same goes for Saul “Canelo” Alvarez who was 42-0-1 when he lost to Floyd Mayweather. Mikey Garcia was 39-0 when he lost to Errol Spence, Jr. “Sugar” Shane Mosley was 38-0 when he lost to Vernon Forrest who was 35-0 when he lost to Ricardo Mayorga.
Speaking of Julio Cesar Chavez he was 87-0 when he drew with Pernell Whitaker. He was 89-0-1 when he lost to Frankie Randall. Willie Pep was 62-0 when he lost to Sammy Angott. Luis “Yuri Boy” Campas was 56-0 when he lost to Felix “Tito” Trinidad. Trinidad was 40-0 when he lost to Bernard Hopkins. Nino LaRocca was 56-0 when he lost to Gilles Elbilia. Recently Chayphon Moonsri was 54-0 when he lost to Panya Pradasbri. Aaron “The Hawk” Pryor was 36-0 and came back to lose to Bobby Joe Young. Joe Calzaghe was 46-0 but retired due to hand injuries. Sven “Phantom” Ottke retired at 34-0. Then there was Mini and Light Fly champion Mexico’s Ricardo “Finito” Lopez, 51-0-1!
Will Floyd “Money” Mayweather at 50-0 comeback and lose his “0”?