I think you would have an extremely hard time beating Pulvers, I mean the guy didn't just have the run of the mill physically abusive drunken father, the guy used to stick guns in Jen's mouth and mentally berated and brainwashed him till Jens literally had nothing to live or die for. Pulver has credited this nothing to live for no fear of death and his ability to harness that anger with a lot of his success in his career and has said that part of his decline comes from the fact that so much good has come into his life that he struggles to find that deep down angry place he used to go to when he fought.
"If you get hit and it hurts hit him back you not knocked out yet."-Joe Doerksen
The Toxic Terrors (FFL)
Demetrious Johnson*Eduardo Dantas*Rafael Silva*Zach Makovsky*Michael Page