Name some fighters who are not natural heavyweight's who had success at heavyweight

[Joey Giardello]

Fighters who were natural lightheavyweight or cruserweight who had success at heavyweight

[BostonGuy]

Tomas Adamek....

[Mersey]

Holyfield
Spinks
Haye

[-MAKAVELLI-]

Oldyfield
Michael Moorer

[Squizz]

James Toney. RJJ.

[starkiller]

Holyfied, James Toney and thats all I mention for now... Haye? Haye fights old shot fighters at heavyweight, how can anyone take that seriously?

[BrooklynBomber]

I cant say Holyfield was not a natural heavyweight. Yeah, he started at l-heavy/cruiser, but he filled into a heavyweight frame nicely. He very often outsized his opponents(mike tyson) and was quite imposing physically.

[Earl-Hickey]

I cant say Holyfield was not a natural heavyweight. Yeah, he started at l-heavy/cruiser, but he filled into a heavyweight frame nicely. He very often outsized his opponents(mike tyson) and was quite imposing physically.

Tyson could have been a c/w easily, he was short but built like a tank.

[New England]

Rocky Marciano never weighed in much more than 185 lbs

[Mr. Philadel]

The Real Deal
Michael Moorer
Michael Spinks
Chris Byrd
David Haye

ALL held a portion of the HW crown...props to those dudes(**** Haye tho)....Roy was one and done at the weight so I didnt include him....but his historic win at the weight MUST be mentioned....that was big!!.....Adamek IMO is the NEXT lil' man to make his point at HW....for some strange, odd and crazy reason I think Adamek can get over on Vitali and there's no doubt in my mind that he'll beat Haye....Wlad would play chess with him for 10 rounds and then checkmate his ass after a inspirational one minute speech by Manny Steward ....I like Adamek ALOT as a fighter, its something about dude