havent been able to read on the posts on this subject so sorry if i repeat something someone else has said.just want to make the point that Ali would lose to the majority of the top heavyweights of the 90's.developments in training techniques,supplements etc,and the sheer size of the modern heavyweight make it very hard foir Ali to win.this isnt to say he isnt one of the top three heavyweights of all time.think of it like this-jesse owens won three olympic golds in 1936 in times that would be beaten by any college athlete worth his salt now,however owens remains one of the greatest sprinters of all time.if we are talking about how Ali would be if he grew up at the same time as lewis,tyson etc then it would be a somewhat different story