5 UFC stars who were knocked out outside MMA

#4 Former UFC lightweight and welterweight champion B.J. Penn

B.J. Penn suffered four TKO losses in his professional MMA career, but arguably his most embarrassing moment came outside the octagon when a stranger knocked him out in a bar fight in Hawaii.

Penn seemed to implore the man to try and hit him, and he obliged. After a series of wild punches, he connected with a left hook that sent 'The Prodigy' plummeting to the floor. A video of the incident can be seen here:

It was a low moment for Penn, who is one of the greatest fighters the UFC has ever seen. He clinched the lightweight and welterweight titles to hold status as one of the few two-division champions in UFC history, although a series of retirements and subsequent failed comebacks harmed his legacy.

#3 Former UFC fighter Artem Lobov

Artem Lobov vs. Jason Knight 2 full fight video highlights https://t.co/D41JICm58p pic.twitter.com/A8rM2Bsbes
— MMAFighting.com (@MMAFighting) November 17, 2019

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Claiming that Artem Lobov was a UFC star is a massive overstatement since he went 2-5 in his UFC career and 13-15 in his professional MMA career. But 'The Russian Hammer' achieved cult status due to his association with Conor McGregor and his own unique persona.

After a three-fight losing skid saw him cut from the UFC, Lobov joined the Bare Knuckle Fighting Championship. He started his career in the promotion well, with unanimous-decision wins over Jason Knight and Paulie Malignaggi. However, the Russian fighter was brutalized in each of his next two BKFC bouts.

Lobov was knocked out by Knight in their rematch, with a series of accurate punches causing massive swelling to his eye. And in his next fight against Denys Berinchyk, he was knocked down twice before suffering another TKO loss.

Lobov's professional fighting career seems to have reached an end, but he is scheduled to take part in a wheelchair boxing bout against Paddy Holohan later this year.