Saul 'Canelo' Alvarez and Daniel Jacobs needed to be pulled apart during the weigh-in for their middleweight clash.
Canelo and Jacobs fight each other in the unification bout on Saturday night at the T-Mobile Arena in Las Vegas.
Jacobs, aka 'The Miracle Man, is a two-time world middleweight champions and currently holds the IBF belt, with the legendary Canelo holding the WBA and WBO titles.
After the pair had weighed-in, Jacobs hitting the limit of 160lbs while his Mexican opponent was 0.5lbs lighter, it got fractious during the traditional staredown.
They went forehead-to-forehead as tempers boiled over before Canelo pushed the American, leading to angry shouting and the duo being split up.
“Emotions flying high. I ain’t never backed down from a challenge in my life,” Jacobs said.
“I’m from Brownsville [in Brooklyn, New York]. I never did, and I never will. Listen, this is the opportunity of a lifetime.
"I feel like I’m the best middleweight in the world, and that motherfucker right there, he gonna get it. Let’s do this Saturday night! Period! Bumping me with that big-ass head, it’s time to put on.”
Alvarez added : "I see fear, and that was fear right there what he did.
"For me and my people, my team and for my fans, it’s very important [to win]. This is the challenge we have, but I’m ready for it, and we’re going to win.”
When is Canelo Alvarez vs Daniel Jacobs fight? UK start time, boxing TV and live stream
Jacobs has previously revealed he plans to embarrass and damage Canelo in the fight.
“I have a job to do, but I do my job with mean intentions, too," Jacobs said. "So, when that first bell rings, I’m gonna go in there and try to take your head off.
"There’s no buddy-buddy. There’s no amigos. There’s none of that. It’s just going in there and taking care of business.
"I wanna embarrass him.
“Like I’ve always said, this is the name of the game. This is boxing. Ain’t no buddy-buddy inside that ring.
"Somebody could go in there and kill you. Somebody can go in there and do real damage to you, to where I can’t go back to my family and have a normal life.
"I can get really, really hurt. So, I don’t take this thing lightly. I mean, yeah, what you see on the outside is just me being cool and casual.
"But, you know, at the end of the day, I wanna prove that I’m the best – by being the best version of me, but by doing damage, most importantly.”
