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However, the 'Gypsy King' silenced his critics in the February rematch earlier this year as he stripped Wilder of the WBC championship in a masterclass performance.
Fury is expected to face Wilder for the third time in December before turning his attention to an all-British unification bout with Anthony Joshua.
Hearn has backed Fury for the rematch and argued he has "beaten [Wilder] twice already really," but he admitted Wilder remains a "dangerous" opponent to face.
The 41-year-old Matchroom chief told William Hill: "I think Fury has got to be a huge favourite, he's beaten him twice already really.
"But Wilder is dangerous. And you never know a fighter's mindset when they go from achieving what Tyson has achieved with a load of money in the bank.
"How much does that hunger [in Fury] still exist? You can bet your life the hunger will be there for Deontay Wilder.
"But Tyson Fury is a big favourite in that fight. He's really schooled him twice, and I expect him to do so a third time."
Dillian Whyte, who had been WBC interim champ for over 1,000 days, had the chance to become the mandatory challenger for the winner of Fury-Wilder III.
But the 32-year-old Brit saw his dream opportunity smashed to pieces when Alexander Povetkin landed a devastating uppercut in the fifth round of their fight last weekend.
Whyte, who plans to rematch WBC interim champ Povetkin, echoed Hearn's comments and backed Fury as the winner of the third fight.
"I think Fury is going to win again," the 'Body Snatcher' said.
"He's beaten him twice already and I think he's going to win again. I think it will be easier this time around.
"Obviously, he outboxed him last time and he knocked him out this time, so what is Wilder going to bring?
"He can't say 'my punch power, my punch power' anymore, no. He's been dominated. [Fury] took your punch away from you, put you on the back foot and stopped you.
"And then [Fury's] also outboxed him in the first fight when he was rusty, so what's [Wilder] going to do?
"He's not all of a sudden going to become a great mid-range counter-puncher that you haven't done for 40-something fights."
Featured Image Credit: PA
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