The biggest (speculative) upset: Tyson/Douglas OR Mayweather/Berto

Heayweights are so big that anything could happen, anyone with 17 stones of mass can put some power together but Berto ain't doing **** to Floyd

well one upset did happen and the other one did not. if it does then the poll would make sense

Buster at his best was a very good heavyweight! He had alot of problems outside the ring that kept him from reaching his potental. After Tyson was handled by Holyfield there were insiders that thought that Buster could possibly recreate the Holyfield method. The problem was could Buster handle Tysons punches the way Evander did! Buster was stopped but the count was screwed up and he survived to pull the fight off. The odds makers and the fans made the odds the insiders thought that Buster had a shot if he was in top condition and willing to put combos together to stand his ground then back Tyson up, he did! Berto beating Mayweather is the upset of upsets! Berto is 3&3 in his last 6 bouts and was BEATEN by a guy who lost to Mayweather (Gurerro) This is a slap in the face to boxing by lil' Floyd. Ring the damn bell and let this lil' turd go home! Ray

All hell will break lose if it happened. I forgot to vote on my own poll. Mayweather decision loss bigger upset for me

Berto will outbox mayweather, then KO him late

Berto beating Mayweather

Well Floyd is damn near 40 with bad hands "shot legs" and ready to retire. So probably tyson Ty-Doug: 42-1 Fl-Berto: 100-1 Ty at his prime. Fl not in his prime. Berto isn't even a good sparring partner for Floyd, forget being an opponent.

Berto upset would be biggest of all time due to Mayweather's defense. But the only way it could happen is if Mayweather takes a dive.

Odds for the tyson-Douglas fight was like 42-1, im hearing the mayweather-berto fight is like at 80-1

Well Floyd is damn near 40 with bad hands "shot legs" and ready to retire. So probably tyson

Berto over Mayweather on a decision will be a definite all time greatest upset of all time. Anyone can be knocked out but Mayweather being outboxed by a slugger of Berto's caliber will be a mind ****.

Lets put it this way.. Khan has a better chance of UDing GGG at 160lb than Berto has winning a single round against Floyd.

Poll would be nice. Poll added