valuev
michael moorer
I got a pretty poo 71, I was on a conference call during this time so that's the excuse I'm sticking with.
I missed out some really obvious ones though, Marciano being the worst!
I take solace in that each era was well represented in my list, with no major gaps. I should have got the easier recent beltholders like Chagaev and Valuev though, easy points. :-(