Tyrone Spong scored one of the most devastating knockouts in kickboxing history and his final blow genuinely sounded like a gunshot - it was that loud. 

Spong's bout against Michael Duut at Glory 9: New York back in June 2013 will go down as one of the most brutal finishes in kickboxing history. 

And it came after he was floored by a stinging straight right-hand. Within seconds of the bout starting, he got tagged but bounced back to his feet. 

Duut jumped on Spong, landing a few ferocious punches including a hard left-hook that appeared to rock his opponent. 

But Spong remained composed as he avoided Duut's assault. He also kept his distance, setting himself up for a big shot. 

Duut walked onto a monstrous overhand right that caught him flush on the chin, crumbling to the canvas. 

The punch from Spong sounded like a gun shot, with @Grabaka_Hitman claiming it was the loudest punch he's ever heard in person. 

Fans couldn't believe the sound Spong's KO produced. 

One tweeted: "Literally pulled a 'Call an Ambulance! But not for me!'"​

A second wrote: "Right hand from hell. This punch is so insane."

A third added: "This is one of the most vicious overhands ever. Listen to this sh*t."​

Another commented: "What in the f**k is that right hand from Spong?! The sound of that!"

Spong would go onto beat Filip Verlinden then Danyo Ilunga​ in the final.

Meanwhile, he returns to action on the weekend when he takes on Sergei Kharitonov​ at Khabib Nurmagomedov's MMA event.