Mike Tyson has explained why he "had to reciprocate" and slap Jake Paul across the face as the pair went face-to-face in a heated final staredown ahead of Friday's heavyweight bout. Things kicked off at the ceremonial weigh-ins on Thursday night, when security had to step in after Tyson landed a clean shot on Paul.

Mike Tyson and Jake Paul are a day away from their Netflix fight. Here are the highlights and results from Thursday night's weigh-in.

"I'M F--KING HIM UP. HE HITS LIKE A B---H. IT'S PERSONAL NOW. HE MUST DIE." Jake Paul after getting smacked by Mike Tyson 😳 (via @netflix, @MostVpromotions) pic.twitter.com/atZbjf6ksa