#2 Mark Hunt
Having survived a traumatic childhood, Mark Hunt eventually went on to become one of the greatest KO artists of all time, as the man referred to by his fans as the King of the walk-off Knockout, found tremendous success in both the kickboxing as well as MMA realms.
In almost all of his fights, Hunt -- a smaller man by today's Heavyweight standards -- gave up a significant amount of reach and height to his opponents. Nevertheless, the man's legendary toughness helped him even the playing field, albeit to a certain extent.
Hunt is known for his impeccable timing and of course, his ferocious KO power. What's intriguing here, is that giving up a reach and height advantage to most opponents, Hunt would either have to wade through their shots or wait for them to strike and then time them -- Which, needless to say, is an extremely dangerous style of fighting.
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Furthermore, in a sport infested by cheats who resort to using illegal PEDs (Performance Enhancing Drugs) so as to gain an advantage over their opponents, "Hunto" has always been one of the rare clean fighters...