Vitali Klitschko's best win?

Vitali made the same mistakes as Wlad, only difference is that Vitali has the chin to afford those mistakes.

 

Chambers came along during his retirement and worked his way to mandatory for the WBO which his brothers held

Chagaev won the title during his retirement, was injured when Vitali returned and was supposed to fight Valuev. When Valuev ducked him he unified with Volodymyr who Haye had ducked at the same time.

Tua went into semi retirement in 2003 and has never returned to world level

Holyfield in 2002 lost to Byrd, Toney, Donald and stopped being relevant

Byrd is the only one that was remotely possible...but not really. Byrd was with Don King who never let his guys fight the Klychko's unless his guys were mandatories challengers with nothing to lose. Byrd won the IBF belt in 2002 1.5 years after the Vitali fight, never would have unified with either of them and even when Volodymyr was mandatory in 2006 that fight was delayed because of King and Byrd ended up leaving him, Vitali was retired at that point. So there was a 1.5 year period where it was theoreticlly possible but Byrd lost to Vova in his next fight and King wouldn't fight Vitali in a non title bout.

So keep making **** up.