Jake Paul flattened Tyron Woodley with a sixth round knockout to claim his second victory over the ex-UFC champion. Watch here:
YouTuber Paul was originally supposed to be fighting Tommy Fury in Tampa, Florida, but he had to pull out due to illness and injury.
Woodley, 39, stepped up to fill his place after losing to 24-year-old Paul on points in August, but this time around the outcome was much more clear-cut.
The first five rounds were uneventful, with boos echoing around the crowd until an explosive moment of action in the sixth, when Paul caught Woodley with a devastating right hook which sent him face-planting on to the canvas.
Paul has now knocked out every opponent he has faced, and this was his most impressive yet.
The win did not come easily for Paul though, as he sustained a cut in the third round caused by an accidental elbow from Woodley, prompting blood to pour down his face.
For a moment, he seemed more troubled than he ever has by a string of shots from Woodley, but the bout was well and truly put to bed when he landed his crushing hook in the sixth.
Speaking after the fight, he said: "This guy [Woodley] is a legend and respect to him for taking the fight with two weeks' notice.
"It was a tough fight. I had blood in my eyes. I had the job done.
"I was setting the punch up the whole fight. He didn't see it coming. Like a lumberjack, timber. It's got to be the moment of my life."
Woodley had never boxed before facing Paul, and it may have been a different story if original opponent Fury had stepped in the ring.
Explaining why he pulled out in a video shared on Instagram, the 22-year-old said: "Training camp couldn't have gone any better for me for the first week two weeks, but then I contracted a bacterial chest infection which led me to go to the gym, and just not being able to breathe.
"I was in my sparring sessions, pad work sessions, whatever it may be, just not being able to breathe and coughing up huge amounts of phlegm all the time, led me to sleepless nights.
"And that went on for about four weeks, because I had the mindset of, 'I'm going to keep training, I'm going to get through this, I'm gonna have a fight no matter what.'"
He continued: "And four weeks passed and we decided to have a sparring session and I took a little clip to the body and because my body was so weak due to the virus inside of me, I instantly knew something wasn't right.
"I was throwing up from the pain, I was doubled over. I literally got my bag and went straight to the hospital, straight for an MRI scan. And I got the results back the same day and the results uncovered that I had a clean break."