Name one Hall-of-Fame fighter that Wladimir Klitschko has beaten

In defense to Wlad how can he defeat a Hall-of-Famer when there aren't any to face. Now to the poster who are saying he is overrated I think it is a little of both. His fans (the ones who defend his every move on boards like this) overrate him greatly they talk like he could have been great in any era and that is just not true but then the people who don't support him make it like he is a joke and that is not true either as usual the truth usually lies somewhere in the middle and the truth is Wlad is a good solid heavyweight in a weak era.