This is video of an MMA, where it took one fighter all of four seconds to knock out his opponent.

Over the weekend, Garrett Whitman delivered a right kick to the face/head of McKlaine McKinnon, knocking him out in the amateur bout.

So far, Whitman is 2-0 in his young career, with both of his wins coming knockout-style, in less than a minute.

Watch the knockout, below. It won't take long...only four seconds.