HMMM...Easy list to make yet hard at the same time (If that makes sense?)

1.Ali
2.Louis
3.Johnson--Jack would have secceeded in any era
4.Foreman
5.Frazier
6.Dempsey
7.Holyfield
8.Marciano-Why so low? Truth is though he is an all time great his two best opp were way past prime
9.Holmes
10.Tyson

Just missing a spot are...Lennox Lewis,,Floyd Patterson, and Joe Hipp