Vitor Belfort was already in the hunt for Knockout of the Year with his head kick against Michael Bisping.
The former UFC champion is about to have a chance to one-up himself, though. At UFC on FX 8, Belfort will meet Luke Rockhold, who enters the UFC as the final Strikeforce middleweight champion.
With a victory over Rockhold, Belfort would also become the leading candidate for a fight with the winner of an upcoming middleweight title bout between Anderson Silva and Chris Weidman.
As UFC on FX 8 and this important 185-pound contest approaches, let's take a look back at the best knockouts thus far in 2013.