TYSON FURY finally snapped and shoved Oleksandr Usuk at their undisputed weigh-in before launching an x-rated rant at him.
Fury dwarfed the former undisputed cruiserweight champ by whopping 29lbs.
But he had still dropped 15 pounds since his last bout in October.
And Usyk packed on almost a stone since he won last won in August, coming in at a career heaviest.
The two men came to blows when they finally squared off against each other after Fury had refused to look at Usyk during yesterday's press conference.
They went head-to-head for seconds before shoving each other, forcing minders and security to quickly step in.
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Fury then embarked on an expletive-laden rant as he warned Usyk "I'm coming for your heart."
Fury said: "We are ready to rock and roll fireworks to come.
"I am going to knock this f****r out.
"I am coming for his heart, f**k his belts and f**k his team too. S**thouses.
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The 6ft 9in Brit tipped the scales at 262lbs
While 6ft 3in southpaw Usyk looked powerful at 233lbs.
Ice cool Usyk told Fury: "Don't be afraid.
"I won't leave you alone. This is my plan."
In October when he scraped by boxing debutant Francis Ngannou, Fury was a poorly prepared 19st 11lbs.
It's no surprise he was flat as he was 26lbs heavier eight weeks out, up towards 22st.
But he was way too light for the 2019 Otto Wallin bloodbath when he overtrained down to 18st 2lbs.
After Usyk completed the 14st 4lbs cruiserweight division in 2018, he targeted 16st as his ideal heavyweight heft.
But 15st 11lbs has been perfect for him, with two wins over Anthony Joshua and another over Dubois.
TYSON FURY VS OLEKSANDR USYK LIVE: ALL THE LATEST FROM HUGE UNDISPUTED WORLD TITLE FIGHT