Worst one sided beatdown...

[SNVDoublePunch!]

It wasn't a one sided beating, but Evander took a pretty bad beating, however he gave a fair bit back.

[catalinul]

Chavez-Rosario.

[Miburo]

Bowe-Golota II

[BigStereotype]

Leon Spinks, Trinidad, and De La Hoya didn't go on to later sucess though. Those fights were their proverbial "nails in the coffin". Bowe - Holyfield I was a close fight: No beatdown there.

Poet

Bowe-Holyfield I was a pretty good thrashing. Holyfield tried his hardest (and who expected anything else) but I never really thought he had a chance to win it.

Duran-Buchanan
Mayweather-Corrales
Mayweather-Hatton
Pacquiao-Barrera I (I can't even watch this fight, it's disturbing what a pounding he takes)

[sonnyboyx2]

Antonio Margarito vs Sergio Martinez
Frank Bruno vs Bonecrusher Smith
Carl Thompson vs David Haye
Tim Witherspoon vs Frank Bruno
Antonio Margarito vs Miguel Cotto
Buster Douglas vs Oliver McCall
Oliver McCall vs Oleg Maskaev
Winky Wright vs Shane Mosley
Michael Watson vs Nigel Benn
Muhammad Ali vs George Foreman

[Heavy Bag]

Wow, surprised to see no one has mentioned Jack Dempsey vs Jess Willard.

[Kid McCoy]

Khan-Prescott

[JAB5239]

How about the first Greb-Tunney fight?

[The_Demon]

Bowe-Golota II

Was just about to say that,rewatched it last night on ESPN classic-Credit to bowe for staying in the fight,golota was handing him his ass from round 1

[bojangles1987]

If Cotto continues to have success at 154, the Margarito and Pacquiao beatdowns of Cotto would qualify.

Although Lacy was nothing special, doesn't get much more "one-sided beatdown" than what Calzaghe did to him.

What Ali did to Foreman ruined his prime, though it wasn't much a beatdown physically.