Rocky Marciano
Undefeated Marciano (1947-1955) · 1947–1955
Marciano's elite Chin (97) and elite Power (95) define this era.
Trophy Case
1952
The only heavyweight champion to retire completely undefeated
1955
43 KOs in 49 fights — 87.8% knockout rate
1990
Charter inductee — retired undefeated at 49-0
The Story
49-0
Marciano retired with a perfect 49-0 record — the only undefeated heavyweight champion in boxing history (at the time of retirement). He knocked out 43 of his 49 opponents. His relentless, come-forward style overwhelmed opponents who had no answer for his stamina and iron will.
The Brockton Blockbuster
At 5'10" and 185 pounds, Marciano was undersized for a heavyweight. He compensated with work rate, chin, and a right hand called "Suzy Q" that knocked out legends. His conditioning was so superior that he simply wore down bigger men until they collapsed.
Signature Moments
Retiring Undefeated
Marciano knocked out the legendary Archie Moore in round 9 to retain his heavyweight title for the sixth time, then walked away from boxing at 49-0. No heavyweight champion has retired undefeated since.
The perfect ending to the perfect record. Still unmatched in heavyweight history.
49-0 — The Perfect Record
Marciano retired 49-0 with 43 knockouts. He is the only heavyweight champion to retire without a loss. He wasn't the biggest or the most skilled — he was the toughest, the most relentless, and the hardest punching pound-for-pound fighter of his era.
Forty-nine wins. Zero losses. The only undefeated heavyweight champion in history. Rocky Marciano proved that toughness beats talent.
KO of Joe Louis — Ending an Era
Marciano knocked out the aging Joe Louis in the 8th round. Louis, the greatest heavyweight champion of all time, was fighting to pay tax debts. Marciano cried after the fight. He'd just beaten his childhood hero — and he knew Louis should never have been in the ring.
He knocked out his hero and cried. Rocky Marciano respected the sport enough to feel pain when he won.
Career Numbers
Career Record
Only undefeated HW champion — also Mayweather (50-0) at lower weights
49-0 (43 KOs)
Career KOs
43 KOs in 49 fights — no other undefeated champion has that ratio
43
KO Victories
88% KO rate
43
KO Percentage
88%
Title Defenses
HW title defenses before retirement
6
Losses
Undefeated
0
Wins
43 by knockout
49
185 lbs
Fighting Weight
Fought at 185 lbs as a heavyweight — smallest undefeated HW champion ever
275
Total Rounds Fought
275 rounds — undefeated in every single one that mattered
55
Avg Punches Per Round
55 punches per round average — relentless volume from a 185-lb heavyweight
52
Career Knockdowns Scored
52 knockdowns in 49 fights — he dropped someone in nearly every fight
12
Fights Through Cuts
Fought through cuts in 12 fights — his nose was broken multiple times
Season Stats · Undefeated Marciano (1947-1955)
Engine Attributes
Fan Debate
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