MMA fighter Amadeusz Roslik sucker punched YouTube star Sadek while he was filming an interview.
Roslik fights with Polish MMA promotion FAME and has a history of unprofessional conduct since he began in the sport.
In 2020 he was disqualified for knocking his opponent out and kicking him in the face while he was on the floor – an illegal act in official MMA rules.
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Roslik went on to spark further controversy in March when he became involved in a brawl with an MMA counterpart during a press conference that quickly descended into chaos.
Sadek was answering questions during a one-on-one interview with Polish journalist Monika Laskowska when the incident occurred.
Roslik was seen bursting into the frame, landing a blow on Sadek, who was completely caught off guard by the attack.
The YouTuber quickly picked himself back up off the floor and tried to go after Roslik, who was trying to deliver a message to the camera.
Sadek attempted to continue the interview but appeared to be visibly dazed and had blood trickling from his mouth.
The journalist tried to calm him down as security was nowhere to be seen.
Fans were not exactly surprised by the MMA fighter's actions, with one saying he should be banned and arrested.
They said: "He should be banned from the sport and arrested. Happened more than once now." Another added: "Dude literally just needs to wait a few days to get paid to do that."
Another agreed, adding: "This guy should be banned from any good organisations. Absolutely unprofessional attitude." One final fan concluded: "He was also once disqualified for soccer-kicking his opponent unconscious. He should be arrested for this s***, and never allowed to fight again."
It is understood Sadek had been outspoken about the Polish MMA star for several years prior to the attack and recently took a dig at his family, which led to this vicious public attack.
Roslik was set to face his next MMA test this weekend, but it remains to be seen whether the fight will go ahead.
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