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Marciano 49-0, Mayweather 50-0 among excellent boxing careers

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Rocky Marciano undefeated heavyweight champion portrait

Boxing has produced many champions with long winning streaks, but very few retire undefeated. Two of the most celebrated undefeated careers in the sport belong to Rocky Marciano and Floyd Mayweather Jr., whose perfect records still serve as a benchmark every time another fighter begins to approach the finish line undefeated.

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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 title. His mark became one of boxing’s most celebrated records and became the standard for an undefeated career at the highest level for decades.

Mayweather later surpassed that total, finishing his professional career with a record of 50-0 (27 KOs) after a victory over Conor McGregor in August 2017. Two years earlier, Mayweather had already scored one of the most lucrative victories in the sport, defeating Manny Pacquiao by unanimous decision in May 2015.

Several other champions came close to breaking these perfect records before suffering their first defeat at the end of their careers. Heavyweight champion Larry Holmes began his title defense in September 1985 with a 48-0 record before losing a decision to former lithe heavyweight champion and 1976 Olympic gold medalist Michael Spinks.

Brazilian legend Éder Jofre also had a long unbeaten streak before his first defeat. Jofre entered the 1965 bantamweight title fight with a record of 47-0-3 before losing a split decision to the Japanese organization Fighting Harada.

The remaining champions managed to end their careers undefeated. 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 in the final stage of his career. Earlier in his championship career, Calzaghe also defeated Denmark’s Mikkel Kessler in a super middleweight unification fight.

There have been long periods of undefeated fighters in the history of boxing. According to The Ultimate Encyclopedia of Boxing by historian Harry Mullan, notable longer undefeated streaks 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 over the course of long careers, retiring undefeated remains one of the rarest of achievements.

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Categories Floyd Mayweather Jr. and Rocky Marciano

Last updated: 14/03/2026 at 15:08

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Boxing

Ryan Garcia Reacts as Terence Crawford Supports Conor Benn Against Him

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"Ryan Garcia Reacts as Terence Crawford Supports Conor Benn Against Him"

Ryan Garcia has labelled Terence Crawford a “hater” after being told that the all-time great is favouring Conor Benn to pull off a sizable upset.

The 28-year-old will make a first defence of his WBC title against Benn on September 12, headlining an event at Las Vegas’ T-Mobile Arena.

To his credit, it was arguably a career-best performance that saw Garcia dethrone Mario Barriosdominating their February encounter with a unanimous decision victory.

At the very least, it was a vastly improved display than the one he produced against Rolando Romero, who convincingly outpointed ‘King Ry’ in May 2025.

This result followed his year-long doping ban, however, which can perhaps partly explain why Garcia underperformed so spectacularly against his low-volume opponent.

As for his upcoming clash with Benn, most would argue that the American is superior from both a skill and experience perspective, while ‘The Destroyer’ possibly boasts an edge when it comes to heart and durability.

These qualities were evident during his first encounter with Chris Eubank Jr, which he lost by unanimous decision in 2025 before winning their rematch later that year.

It is perhaps based on those two performances, then, that Crawford has decided to back heavy underdog Bennwho has not fought at 147lbs since 2022 and notoriously tested positive for banned substance clomifene that same year.

Speaking with FightHypethough, Garcia could not accept that ‘Bud’ is being fully genuine with his prediction.

“[Crawford] is really a hater – he needs to get out of retirement already. I think I can beat Crawford – I don’t give a f**k about no Conor Benn.”

Crawford called time on his illustrious career in December, just a few months removed from dethroning Canelo Alvarez and becoming a three-division undisputed champion.

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Nelson Hysa vs Thomas Narmo Scorecard Analysis and Highlights

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"Nelson Hysa vs Thomas Narmo Scorecard Analysis and Highlights"

World Boxing News provides a scorecard as unbeaten heavyweights Nelson Hysa and Thomas Narmo collide at the O2 Arena in London.

Hysa enters with a perfect 24-0 record against Narmo at 14-0, with neither heavyweight tasting defeat as a professional.

Someone’s ‘0’ has to go, with the regional WBO and WBA Global heavyweight titles on the line over ten rounds on the Moses Itauma vs Filip Hrgovic undercard.

WBN provides a live scorecard of the contest below, plus live results throughout the event.


Hysa vs Narmo Scorecard

Nelson Hysa vs Thomas Narmo

(Live scorecard will refresh every 2 mins)

WBO and WBA Global Heavyweight Titles
O2 Arena, London
10×3


Round House Narmo
Round 1 10 9
Round 2 TKO
Round 3
Round 4
Round 5
Round 6
Round 7
Round 8
Round 9
Round 10
WBN Totals:

Official Result:


Preview

Hysa puts his unbeaten 24-0 record on the line against Narmo, who arrives in London with a perfect 14-0 record of his own.

The ten-round heavyweight contest carries the regional belts and gives both men the opportunity to make a statement on the Itauma vs Hrgovic undercard.

The Hysa vs Narmo scorecard will continue alongside more live coverage on World Boxing News.


About the Author

Phil Jay is the Editor-in-Chief of World Boxing News (WBN), a BWAA-acknowledged boxing news website founded in 2010. A veteran boxing reporter with 16 years of experience, he has interviewed world champions, broken international exclusives, and reported ringside from major events. His work is published worldwide through WBN and distributed on platforms including Apple News.

Read Phil Jay’s full bio and latest stories.

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Tim Bradley Urges Teofimo Lopez to Seize His Moment with Key Next Fight

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"Tim Bradley Urges Teofimo Lopez to Seize His Moment with Key Next Fight"

Timothy Bradley has urged Teofimo Lopez to face one man after dethroning Rolando Romero for the WBA welterweight strap.

‘The Takeover’ became a three-division world champion last weekend, claiming a majority decision victory over ‘Rolly’ in his first outing at 147lbs.

While Romero was always dangerous, and even hurt his man in round five, it was Lopez who ultimately proved the busier and more skilful operator.

As a result, the 29-year-old is now eager to secure unification matches against either Devin Haney, Liam Paro or the winner of Ryan Garcia vs Conor Benn, which takes place at Las Vegas’ T-Mobile Arena on September 12.

At the same time, though, Lopez could soon be ordered to face mandatory challenger Jack Catterall, who claimed his WBA ‘regular’ title with a unanimous decision victory over Shakhram Giyasov in May.

Before that, WBA president Gilberto Mendoza had ruled that the winner would earn his shot at the full welterweight belt within 180 days of their contest taking place.

And while, admittedly, a title defence by November 19 seems entirely unrealistic, Bradley has nonetheless expressed his desire for Lopez to face leading contender Catterall.

“Teo, you gotta face Jack Catterall next. Yeah, you gotta honour that [mandatory duty]. You just got the belt, right? You gotta defend that title against Jack Catterall.

“He’s been waiting patiently, and it’s his time and his opportunity.”

While Catterall does, indeed, appear to be in a strong position with the WBA, Lopez’ manager Keith Connolly is actively exploring a route for the American to swerve his mandatory duty and chase more lucrative opportunities.

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