As i've said previously, after studing his early fights closely i can tell you that tyson was starting to decline by the end of his 19 fight ko streak. Winning the belts lifted his fighting level up to what it previously was but after douglas he was done. I think a Prime tyson is a handful for anybody and i'm talking prime prime. If lewis can stay away from him he wins. I'm leaning toward tyson by late ko (if mccall and rahman can drop lewis so can tyson) but it really could go either way.