Ironically, Leonard did defeat a Floyd Mayweather, just not the one most fans think of.
In September 1978, the unbeaten Leonard stopped Floyd Mayweather Sr. in the tenth round after dropping him twice in the eighth. Mayweather Jr. was only a year old at the time, but his father’s loss remains a fascinating piece of trivia whenever the two legends are compared.
Leonard wasted little time building a monster resume. Following the victory over Mayweather Sr., he defeated Randy Shields, Armando Muniz, Tony Chiaverini, and Pete Ranzany. He then stopped the undefeated Wilfred Benítez in the fifteenth round to capture the WBC welterweight title.
His willingness to take risks separated him from many champions.
Rather than protecting his title, Leonard faced Roberto Durán in June 1980, losing a unanimous decision in a brutal battle. Five months later, he completely tore up his original strategy, boxing circles around Durán until the Panamanian icon famously quit in the eighth round with the “No Más” surrender.
Leonard kept chasing elite opponents. He stopped the unbeaten Ayub Kalule before producing a career-defining victory against the undefeated Thomas Hearns in September 1981. Trailing on all three scorecards entering the fourteenth round, Leonard rallied furiously to stop Hearns and unify the welterweight championship.
His career nearly ended the following year when he suffered a detached retina while preparing for a title defense. After a 27-month layoff, Leonard returned to stop Kevin Howard before taking another lengthy break.
Most fighters would have eased back into competition.
Instead, Leonard challenged middleweight champion Marvin Hagler after nearly three years out of the ring. Despite the long absence, along with moving up in weight, Leonard earned a split-decision victory in one of the most debated championship fights in boxing history.
He followed that by stopping Donny Lalonde to win the WBC light heavyweight title, while also claiming the inaugural WBC super middleweight championship. Leonard later fought Hearns a second time, battling to a split draw after climbing off the canvas twice, before defeating Durán in their trilogy bout.
His career ended with losses to Terry Norris and Héctor Camacho, finishing with a 36-3-1 record that earned him an easy induction into the International Boxing Hall of Fame.
Mayweather’s career tells a completely different story.
He retired 50-0 while winning world titles in five weight classes. His resume includes victories over Diego Corrales, José Luis Castillo, Arturo Gatti, Oscar De La Hoya, Ricky Hatton, Juan Manuel Márquez, Shane Mosley, Miguel Cotto, Canelo Alvarez, and Manny Pacquiao.
Not every victory came without debate. Many fans believed Castillo deserved the decision in their first fight, while others scored the first Marcos Maidana bout even. Mayweather answered both performances by defeating each man clearly in the rematches before closing his career with victories over Andre Berto and UFC champion Conor McGregor.
Comparing the two legends ultimately comes down to what fans value most.
Leonard repeatedly fought Hall of Fame opponents in their prime, accepted enormous risks after long layoffs, and jumped through multiple weight classes to chase the biggest challenges available. Mayweather perfected the art of winning, solving every style placed in front of him over a 19-year championship career without suffering a single official defeat.
If greatness is measured by taking on the toughest opposition regardless of the risk, Leonard has a compelling case. If it is measured by sustained excellence, technical mastery, and an unbeaten record, Mayweather’s argument is just as strong.
That is why the debate remains one of boxing’s most enduring, and it is why there is still no unanimous answer.
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