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Users on social media site Reddit delved into the archives to pick out some of the most decisive stoppage wins ever recorded in mixed martial arts’ relatively short sporting history.

And, during season seven of The Ultimate Fighter, Riddle delivered exactly that, stopping Simmler with a highlight reel finish crowned “KO of the century” by UFC legend Rampage Jackson.

“I felt really bad because that’s one of the most gruesome knockouts I’ve ever seen,” Jackson said.

(Image: STREAMABLE/UFC)

Just moments after touching gloves entering into the second round, Riddle caught Simmler with a monstrous right hook to the chin, dropping the middleweight to the canvas.

He followed up with two powerful ground strikes, leaving Simmler out for the count as the referee dived in to halt the fight.

In scary scenes after the bell, Massachusetts native Simmler lay prone on the ground, groaning worryingly as medical staff tended to him.

Eventually, he regained consciousness and was able to make it to his feet.

(Image: STREAMABLE/UFC)

After the fight, he said: “The first thing I remember was at the hospital.

“I have a deviated septum in my nose, I can’t breathe good at all with out a breathe-right strip. I had one on and right before my fight but I was told I couldn’t wear it.

“I wasn’t given a good reason, just that I couldn’t, so as a result, I was breathing through my mouth the whole time.

“That just made things worse when I got hit. My mouth was wide open and I broke my jaw in three places. Two on the left, one on the right.

“It was very painful to say the least.”

Riddle would go on to win season seven of the show, earning a UFC contract in the process.