I think the top three is pretty easy with Tyson/Douglas, Holyfield/Tyson and Foreman/Moorer. All of those are historical wins and were upsets. The fourth one is very debatable imo. I went with McCall vs Lewis simply because I think Lewis was the best fighter on the list and McCall was the worst. I remember being shocked when I saw it live. No one gave McCall much of a chance.