I dont know much about old fighters,so just bare with me:

1.Ray Robinson
2.Muhammed Ali
3.Ray Leonard
4.RJJ
5.Pernell Whitaker
6.Roberto Duran
7.Marvin Hagler
8.Julio Cesar Chavez
9.Joe Louis
10.Bernard Hopkins
11.Archie Moore
12.Alexis Arguello
13.Ezzard Charles
14.Benny Leonard
15.Carlos Monzon
16.Gene Tunney
17.Evander Holyfield
18.Tommy Hearns
19.Ricardo Lopez
20.Oscar Delahoya