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This is a fact that Donelei Benedetto found out in the most devastating way possible when he was knocked out in under three seconds by Ulysses Diaz - the fastest ever in the competition's history.
Footage from the pair's bout in a Bare Knuckle Fighting Championship event in Miami, Florida, on Friday night (13 November) has seen shared online and it is really quite something.
See for yourself below:
The starting bell was still echoing as this man hit the canvas #BKFC14 pic.twitter.com/ODJs1FlN1H
- MMA Gone Wild (@mmagonewild) November 14, 2020
Benedetto can be seen lining up against Diaz, both seemingly ready and raring to go, their fists raised.
But as soon as the referee kicks things off, the Cuban fighter lunges at Benedetto and sends him crashing to the canvas after connecting with a thunderous right hand.
The ref quickly dives in to the break it up, calling an end to the contest.
Unsurprisingly, the footage made quite the impression on viewers who were stunned by the speed and ferocity of Diaz.
Commenting online, one person said: "The starting bell was still echoing as this man hit the canvas."
Another wrote: "People won't stop talking about this for a long time."
While a third added: "Jesus..."
Bare-knuckle boxing has been on the rise in recent years, with blood-thirsty fans packing into arenas to watch competitors go at it.
And across the pond in the UK, a labourer binned his day job to become the most dangerous bare-knuckle-boxer in the world.
Mickey Parker, 36, from Leigh Park, Hampshire, has been in and out of prison in the past and says the sport has given him a new life.
He told the Sun: "BKB has completely changed my life.
"Before I was involved in it I was somewhat a little rogue getting in trouble all the time and genuinely not being a nice person.
"My wife went through hell with me and her and my daughter had such a hard time when I was younger due to me being in prison.
"But the second I laced up a pair of boxing gloves, my life changed forever and since turning over as a pro with BKB I live a completely different life.
"I had a lot of unlicensed fights and a few people mentioned BKB to me because of the way I fought, then my coach took me to BKB5 to watch his friend and now mine, Kevin Bennett, win the world title and I've been hooked ever since."
Featured Image Credit: Bare Knuckle Fighting Championship
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