UFC middleweight title contender Sean Strickland has threatened to kill YouTube star Bradley Martyn after the muscle-bound celebrity claimed he could beat an MMA champion in a street fight.

Martyn, who famously references his weight of 260lb, or around 18-and-a-half stone, believes that despite his lack of fight training his size alone could see him to victory on the streets against a smaller UFC champion. He has already been called out by the likes of flyweight legend Demetrious Johnson and others, with Strickland the latest to take offence.

The controversial middleweight doesn't quite match the description of Martyn's ideal opponent, but has thrown his hat in the ring to face the body builder at any time. He invited Martyn down to Las Vegas where his training camp is based, claiming that he would cause brutal damage if the pair squared off.

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“Who the f*** is Bradley Martyn?" Strickland asked in an interview with Nina Drama. "I don’t know this Bradley Martyn, but if you’re here right now and I can get away with it… I would take your f***ing life. I would kill you. I would put my gun down and would f***ing take your f***ing life.

“Nina gave me a little backstory… that you challenge people. Motherf***er, I’m in Vegas, you show the f*** up, you little b****. Sign a waiver and we will see how many bones we can break in your f***ing face. If he was right here and he was like, ‘Sean, I think I can beat you in a street fight,’ I would get up. I would put my gun down, and I’d backhand him like the little b**** he is."

Do you think Bradley Martyn should take up Sean Strickland's challenge? Let us know your thoughts in the comments section below!

Martyn appeared to take the violent threat lightly, responding to a tweet with a clip from the interview by repeating his notorious catchphrase "He must have not heard… I’m 260." He regularly notes his weight when insisting that he could defeat a world champion such as Johnson, who routinely weighs in around 125lb or 135lb.

Strickland is currently in Sydney, where he is preparing to face Israel Adesanya for the 185lb world title at UFC 293. He has already courted controversy during his brief stint, punching a fan on the street and sparring another at an open workout during an explosive few days on Australian soil.