Interesting stuff! It's a match-up I never even thought about. I would say although Holyfield fought and beat aggressive fighters like Tyson, Frazier was like the 'Terminator' and never stopped unless you stopped him and I don't think Holyfield could have done that. 12 rounds I think Evander could pull it off if he boxed a very smart fight. 15 Rounds I think Frazier stops him late in the 14th or 15th.