...definatly a contender.
http://www.youtube.com/watch?v=JSR8qogJlZ4&feature=player_embedded (http://www.youtube.com/watch?v=JSR8qogJlZ4&feature=player_embedded)
Epic, but it has to be Cheick Kongo vs Pat Berry.
The fact he was clearly unconscious when he threw the uppercut makes it all the more epic. :p
I donno about Kongo/Barry being KO of the year, defiantly a contender like this one, but that was more of a sure lock up for comeback of the year.