Anytime I see a gruesome KO like against CroCop I wonder if its the nastiest I've ever seen. Considering I watch boxing, K1 and MMA anytime and any variety when its on the tube this can be a hard question. But seriously I don't know if I've ever seen a more devastating KO than that. The speed and ferocity of the blow, the crack it made, the way Mirko collapsed and the gross way his body and particularly his leg slumped man that might just be the best