Rocky Marciano and Floyd Mayweather ~ 'Don't Put Them In The Same Sentence'

[corvette]

I don't understand what Marciano record people are talking about. Finito Lopez retired at 51-0. JCC went to 89-0 before losing. What record does Marciano have except for a HW record?

Forgot all about Finito.

Thanks for bringing him up...helluva fighter.