#4. Superbon Banchamek's knockout of Giorgio Petrosyan (One Championship: First Strike)
This is perhaps the most violent headkick knockout in ONE Championship history. The relatively unknown Superbon Banchamek shocked the kickboxing world by separating the mythical Giorgio 'The Doctor' Petrosyan from his senses.
Petrosyan, known as one of the best pound-for-pound kickboxers of all time, entered the ONE circle with multiple world titles under his belt. The Armenian-born fighter's clinical offense and lockdown defense should have allowed him to breeze past Superbon. Having only lost twice in over 100 fights prior, Petrosyan was the heavy favorite to win the bout.
However, the Thai fighter had other plans. Early on, Petrosyan tried to bully Superbon by constantly moving forward while throwing some hard kicks and punches. Superbon, however, was not easily fazed as he answered Petrosyan's aggression with his own; kick for kick and punch for punch.
Early in the second round, Superbon made history with a picture-perfect left hook-high kick combination that immediately knocked Petrosyan out cold. The Armenian-Italian legend dropped to the floor like he was shot by a gun. The knockout was ruthless, violent, and amazing.
#3. TJ Dillashaw's knockout of Renan Barao (UFC 173)
This is one of the most lopsided underdog wins in MMA history. TJ Dillashaw put on a striking clinic against the then-scariest 135-pound fighter in the world, Renan Barao.
Barao, famous for being the training partner of featherweight legend Jose Aldo, hadn't lost an MMA fight in nearly a decade. The Brazilian had run roughshod over the UFC's bantamweight division and looked to be unstoppable in the cage. Dillashaw, on the other hand, was mostly known as a strong wrestler with some KO wins on his record.
No one saw the kind of beatdown the American challenger put on the Brazilian champion coming. Barao never got any good licks in while Dillashaw, under the tutelage of head coach Duane Ludwig, dismantled the champ flawlessly. His devastating strike combinations and dizzying footwork lead to a decisive technical knockout victory.