Rocky Marciano

he is the greatest of all time and he also has the greatest single punch of all time when he knocked out joe walcott for the heavyweight championship of the world. 49-0. he is also my favorite boxer of all time. 49-0.

HAHA No Losses

Emery

Its because he didn't have the mouth Ali had or the flash. He is truly the greatest and defines what a true boxer is.

this is a good example of a great Italian boxer

he's the greatest muhamed ali ain't got nutin compared to him he's the greatest of all time no one could beat him!

rocky marciano would have killed muhammad ali and thats a fact

Although Ali is #1 in my book, Marciano and Sugar Ray are 2 and 3. No losses for Marciano though which is amazing.

Crazydudewithabeard

no loses says it all

TrinityTrojan

Only undefeated heavyweight champion in history, 49-0

ironknuckle