5 Best Undefeated Boxing Champions In History

Retiring undefeated as a boxer is a tall task, and retiring as an undefeated champion is almost impossible. Out of the thousands of boxing champions in history, only about 15 of them have retired with unblemished records. 

Boxing like many sports can be a game of inches, and it often takes a single mistake to end up on the losing side of things. That means the boxing champions who retired undefeated had to stay mentally and physically disciplined during their careers, to ensure they performed at their very best on fight days. 

This article will take a close look at the five most impressive undefeated boxing champions in history and explore their stories. 


The Five Most Memorable Undefeated Boxing Champions In History

Ready to find out who the most impressive undefeated boxing champions in history are? Let’s jump right into our list:


1) Floyd Mayweather (50-0-0, 27 KOs)

Floyd Mayweather is without a doubt one of the best boxers to ever step inside the ring, retiring with an unblemished 50-0 record, dominating boxing from 1996 to 2017. Floyd won 15 major boxing titles during his career in five different weight classes, starting from super featherweight and fighting as heavy as light middleweight. 

Mayweather secured his first title in 1998 when he defeated Genaro Hernandez for the WBC super featherweight title. He then went on to win titles at the super lightweight, lightweight, and light middleweight divisions, defeating fighters like Canelo Alvarez, Miguel Cotto, and Oscar De La Hoya who were all considerably larger than he was. 

However, Mayweather’s ideal class was the welterweight division where he outclassed fighters like Zab Judah, Ricky Hatton, Robert Guerrero, and Manny Pacquiao. 

Mayweather’s virtually impregnable defence and his sharp counter-attacking abilities are responsible for most of his success inside the ring. His often-underestimated power also played a major role as fighters who tried to crowd him or force him to fight at close range quickly learned how hard he hits. 

Mayweather defeated all the great boxers of his era and only a few like Shane Mosley and Marcos Maidana ever managed to land hard, clean punches on him. He might be the greatest defensive genius in boxing history, walking away from boxing with a perfect 50-0 record and 16 shiny belts to remind him of how dominant he was during his reign. 


2) Rocky Marciano (49-0-0, 43 KOs)

There’s no question Marciano is one of the greatest heavyweights to step inside a ring. Many would argue that he should even be on the top of our list considering how hard it is for heavyweights to remain undefeated. 

Force equals acceleration times mass, which means heavyweight boxers hit harder than everyone else. It only takes one mistake in the big boy division to find yourself on your back staring at the arena lights. 

Marciano was small for a heavyweight, but that didn’t stop him from compiling an 87.8 knockout percentage. He knocked out his first 16 opponents inside the ring and dramatically won his first title fight by knocking out Joe Walcott during the 13th round of their showdown. Walcott was leading on the scorecards before the knockout. 

Rocky went on to defend the title six times in two years, defeating big names like Archie Moore before finally calling it quits. Marciano’s endurance and ferociousness had a lot to do with his success inside the ring, and many fans loved him for it. He wasn’t the most technically gifted boxer, but he typically hurt his opponents whenever he landed a clean punch. He was an expert at closing distances and unloading punches on opponents until they couldn’t take anymore. 


3) Joe Calzaghe (46-0-0, 32 KOs)

Calzaghe might be the least known undefeated champion on our list despite his many accomplishments inside the ring. He is widely regarded as the best super middleweight in boxing history and defended the WBO title 21 times in a little more than ten years, setting a super middleweight record that still holds. 

Calzaghe was the first boxer to unify three of the major belts used in the four-belt era and is widely considered the greatest European boxer of all time. He started his career in 1993 and won his first title in 1997 by defeating another European legend, Chris Eubank. 

Despite Calzaghe’s impressive boxing record, most of his most notable accomplishments came toward the end of his career, like his victories against Roy Jones Jr. and Benard Hopkins. 

Joe Calzaghe isn’t just one of the most impressive undefeated champions in boxing history, his unique fighting style made him a fan favourite. From his non-stop aggression to his shimmying to taunt opponents, Calzaghe was one of the most interesting characters in boxing history. 


4) Ricardo Lopez (51-0-1, 38 KOs)

Ricardo Lopez is the only boxer on our list who was undefeated in his amateur and professional boxing career. The only blemish on his record was a draw against Rosendo Alvarez, who he defeated via split decision during their rematch eight months later. 

Lopez finished his professional boxing career with 21 title defences, holding on to the belt from 1990 to 1998. His biggest asset inside the ring was his unmatched technical savviness. He was the Mayweather of his time, frustrating opponents with his unbreakable defence and punishing them with hard counters. He was an expert at the art of hitting without getting hit. 

Lopez spent most of his time inside the ring fighting on the outside, and opponents often thought they could defeat him by forcing him to fight at close range. Unfortunately for them, he was just as good fighting inside as he was fighting at range. 

Another interesting thing about Lopez’s career was how powerful his punches were. He retired with an unmatched 75 percent knockout ratio while fighting as a mini flyweight. 


5) Andre Ward (32-0-0, 16 KOs)

Andre Ward was widely regarded as one of the pound-for-pound best boxers on the planet at his peak. He was an incredibly technically savvy boxer who started his pro boxing career after winning a gold medal at the 2004 Olympics. 

Ward was part of the Super Six World Boxing Classics tournament where he defeated former champions like Arthur Abraham, Mikkel Kessler, and Carl Froch. He enjoyed similar success after moving up to the light-heavyweight division, defeating Sergey Kovalev to unify most of the major titles in the division. His ability to adapt his style to any opponent was a thing of beauty to watch, particularly his jab which he used to control range and damage his opponents. 


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