#8 Travis Browne vs. Alistair Overeem

This one is perhaps one of the most brutal KOs you'd ever come across, not only in the sport of MMA, but in all of the combat sports world.
A rather surprising fact that most people seem to forget about Travis "Hapa" Browne's 1-round fight against Alistair Overeem, is that The Reem had Hapa badly hurt. In fact, Overeem almost finished Browne--with a barrage of punches, elbows, kicks and knees early on.
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Nevertheless, Overeem appeared to have emptied his gas tank trying to finish the resilient Browne. Hapa then miraculously found a second wind, tagging The Reem with a couple of front kicks to the body and head.
While the aforementioned kicks didn't really find their mark, they did help Browne gauge the distance. He then proceeded to throw a front kick to Overeem's chin--straight down the pipe.
The strike connected flush on Overeem's jaw, and the hulking Dutchman went down--following which, Browne landed a few nasty ground-and-pound strikes on The Reem before the match was called off.