Badou Jack piled the pressure on his opponent Illunga Makabu and eventually stopped the Congolese boxer in the 12th round.
The win meant Jack won the WBC cruiserweight title, ending the three year reign Makabu had over the belt.
But fans could not help but notice boxing legend Mike Tyson’s reaction when Jack’s flurry of punches brought the fight to a premature finish.
The cameras cut to Tyson and the 56-year-old could be seen cracking up in laughter as he watched on.
Fans could not believe their eyes at the moment.
One on Twitter said: “Imagine getting knocked out and Mike Tyson is ringside laughing at you.”
Another added: “Nah Mike Tyson a savage why is he laughing at my man like that.”
While another fan said: “Mike Tyson laughing his arse off at that Makabu TKO.”
And another amused viewer added: “LMAOO Mike Tyson was laughing at Makabu getting stopped.”
Jack, 39, appeared to be comfortable throughout most of the fight and dropped his opponent in the fourth and eleventh round.
With that fight concluded, it allowed Tyson and the rest of the audience to look forward to the main event.
Tyson has already made his prediction on who he believed would prevail between Paul and Fury.