Floyd Mayweather Jr.
Rocky Marciano
Stat by stat
Bars are scaled to the leader in this list.
The verdict
Rocky Marciano leads 1 of 2 categories. Our all-time ranking places Floyd Mayweather Jr. at #5 and Rocky Marciano at #12.
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The case for Floyd Mayweather Jr.
Mayweather retired at a perfect 50-0, breaking Rocky Marciano's iconic mark, having won 15 world titles across five weight divisions from super featherweight to super welterweight. The most defensively brilliant fighter of his era, he built his mastery on the Philly shell, elite reflexes, ring IQ and pinpoint counter right hands, making elite opponents miss and pay for two decades. He beat a long list of champions, Oscar De La Hoya, Manny Pacquiao, Canelo Alvarez, Juan Manuel Marquez, Miguel Cotto and Shane Mosley, and was virtually never in trouble across 26 years. He also transformed the business, becoming boxing's biggest pay-per-view attraction and generating over $1.3 billion in career PPV revenue; the 2015 Pacquiao fight alone drew roughly 4.6 million buys. Critics note a cautious, risk-averse style and carefully timed matchmaking, but the ledger, unbeaten, five divisions, a generation of top opponents defeated, is nearly unanswerable.
The case for Rocky Marciano
The only heavyweight champion in history to retire undefeated and untied, Marciano finished a perfect 49-0 with 43 knockouts, an 87.8 percent knockout rate among the highest of any champion. Undersized for a heavyweight at under six feet and around 185 pounds, the Brockton Blockbuster overcame reach and skill deficits with relentless pressure, a granite chin, extraordinary conditioning and concussive power, most famously in the Suzie Q, his overhand right. He won the title in 1952 by knocking out Jersey Joe Walcott, whom he was losing to on the cards, with a single thunderous right hand in the 13th round, and defended it six times before walking away in 1956 at his peak, a rarity in any era. Critics note a shallow heavyweight field, but no one else combined a flawless record, a near-90 percent knockout rate, and the discipline to retire on top and stay retired.