Nobody fighting currently I don't think. To my knowledge only Valuev is close but I really can't see him going another 3 or 4 fights without being beat.

As soon as he tries and unifies it's pretty much all over for him.

Calzaghe could beat the 49-0 but obviously not in the same weight class, Mayweather possibly.

Overall though I'd say Kessler may have the best chance. I think he's 37-0 or therabouts and as long as avoids Calzaghe I can see him beating everyone at 168.

Him and Calzaghe is a 50/50 fight imo.