5 UFC fights that were finished in the first round

#4 Anthony Johnson vs Glover Teixeira

Rumble was a terrifying individual in the UFC

Anthony Johnson is regarded by many as one of the most terrifying athletes to have ever graced the UFC's famed Octagon. 'Rumble' possessed KO power that would knock anyone out on a given day, irrespective of how great and technical the opponent may be.

Johnson faced then-top contender Glover Teixeira at UFC 202 in 2016, and most fighters expected the latter to take this fight to the mat at the earliest and submit the former. Nevertheless, Johnson made sure the fight didn't get out the first minute, let alone the first round, catching his Brazilian foe with a picture-perfect right uppercut.

The uppercut put Teixeira out on his feet, and after the latter's unconscious body fell to the mat, Johnson followed up with a few scary ground strikes, as the referee thankfully rescued the downed veteran. Rumble's 13-second KO of Teixeira has gone down in history as one of the scariest KOs of all time.