Which contender has the shot of pulling off the upset?

[Brockton Bomber]

I'd say Manfredo because he has a puncher's chance.

calzaghe been in with alot hard hitters than manfredo and manfredo isnt exactly one hit ko artist

I concur. But Joe C has also been dropped by guys who don't hit as hard as Manfredo at 168. Plus, Peter seems to know how to finish the job lately when he has someone hurt.