Great fighters stand out, from the turn of the century we have had Johnson, Dempsey, Louis, Marciano, Patterson, Liston, Ali, Frazier, Foreman, Holmes, Tyson, Holyfield, Bowe and as much as I hate to say it Lewis.

Those are the obvious tops but what order they go in can be interprated anyway.

Frazier and Foreman are there more because of Ali than their own merits, Frazier more so, Foreman had a relatively successfull comeback and became the oldest ever champ.