Nah Calzaghe could beat Kessler pretty easily. Calzaghe does best against the upright come forward boxers. Kessler is decent enough but he hasn't been in a brawl and can't fight at 100 mph - I don't think he's experienced enough at the top either.

Calzaghe looks bad against the Salem's and Bika's of this world. Fighters not in the top 5 but could easily pull of an upset due to their style of fighting.