49-0
Defeated Joe Louis at 36, Archie Moore, Ezzard Charles, Jersey Joe Walcott.
Retired Joe Louis, KO out of the ring, who was on a 3 fight Win streak.
Rocky dished out many concussions, others had to have their welts surgically removed.

Louis said Marciano could beat him in his prime himself, and Ali too.
Marciano once gave a prime fighter brain damage with an upper cut, he also knocked 6 of PRIME rex laynes teeth out with a punch,
He defeated a PRIME undefeated Roland la Starza twice. . His KO percentage was THE HIGHEST OF ALL TIME, 88.75%, HIGHER than FOREMANS, TYSONS, MUHAMAD ALI, FRAZIER, LISTONS, DEMPSEYS. He has only been dropped twice. Rocky didnt become pro until age 25.
A Legit Cruiser at 185-190, he was outweighed in every fight but one. Rocky put them all on Queer Street.

Dominated in an era where boxing was the biggest sport in the world -5 years after he started training; he knocked out the longest reigning champion of all time (Joe Louis)
And accomplished all of this at 5'11" 188lbs with the shortest reach of any heavyweight champion.