ATG?

Ha!

Lennox Lewis - 13 Title Defences + Undisputed
Vitali Klitchco - 12 Title Defences
Vladimir Klitchco - 23 Title Defences
Muhammed Ali - 19 Title Defences
Larry Holmes - 20 Title Defences
Holyfield - 8 Titles Defences (he fought most of his career at cruiserweight)
Mike Tyson - 10 Title Defences

Tyson Fury - 3 Title Defences

Even AJ has 7 title Defences...