Diego Rivas wasn't playing around in the second round of his Saturday night fight against Noad Lahat.
As the two squared off in the middle of the Octagon, Rivas keyed in for a flying knee and caught Lahat right on the button, knocking him out instantly.
Lahat was knocked out for couple minutes while EMTs tended to him, but he was able to walk back after the fight.
Absolutely stunning.
