Tyson Fury has explained that he thinks he will be too big for Oleksandr Usyk to challenge him.
The heavyweight pair fight for the undisputed status on May 18, live on DAZN PPV.
Usyk is the unified IBF, WBO and WBA champion, while Fury holds the WBC strap.
The Ukrainian is also a former cruiserweight champion, and while that commands respect from the Briton, he is not overawed by the smaller man.
He said: "It's not personal. It's strictly business for both fighters. There's a lot of stuff on the line, but I don't hate him.
"I respect him as a man, as a fighter.
"Anyone would have to respect the man's achievements. He's unified heavyweight champion, undisputed cruiserweight champion.
"I'm the best. I'm just defending my 'best-ness' against him," he declared.
"We have weight divisions for a reason. When the cruiserweights step up to the big boys, usually they get found wanting.
"You can beat the average big ones, but you can't beat the elite big ones because size really matters.
"These are facts.
"I've studied this game all my life. This is my time, my destiny, my era and my generation. Facts."
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