As a Heavyweight #10:

15: Harry Wills
14: James Corbett
13: Sonny Liston
12: Joe Frazier
11: Mike Tyson
10: Lennox Lewis
9 James Jeffries
8: Jack Dempsey
7: Rocky Marciano
6: Evander Holyfield

In the All time lists #81

88 Mike Tyson
87 Luis Rodriguez
86 Joey Archibald
85 Sot Chitalada
84 Jeff Chandler
83 Joe Walcott (The original)
82 Ken Buchanan
81 Lennox Lewis
80 Flash Elorde
79 Jim Jefferies
78 Lupe Pintor
77 Floyd Mayweather Jr
76 Billy Conn