in boxing a perfect record means alot but in away i feel that an undefeated fighter is more up for debate than say a fighter who has lost but comeback & won a rematch.

marciano
mayweather
calzaghe
sven ottke

as apposed to fighters who lost & came back to avenge loss

lennox lewis

or fighters who fought the best there was out there

ali
frazier
foreman
holyfield
hagler
hearns
Sugar ray robbinson
sugar ray leonard

i feel there is just to much emphasis on undefeated fighters, as if its the end of the world that they lost