So far I've listed 12 fighters. Here they are in order of most top 10 fighters faced.
Joe Louis 19
Evander Holyfield 18
Floyd Patterson 16
Larry Holmes 15
Lennox Lewis 14
Mike Tyson 12
Primo Carnera 12
George Foreman 11
Sonny Liston 10
Wladimir Klitschko 10
Rocky Marciano 9
Vittles Klitschko 6
Joe Louis 19
Evander Holyfield 18
Floyd Patterson 16
Larry Holmes 15
Lennox Lewis 14
Mike Tyson 12
Primo Carnera 12
George Foreman 11
Sonny Liston 10
Wladimir Klitschko 10
Rocky Marciano 9
Vittles Klitschko 6
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