Dereck Chisora has promised to shock the heavyweight division when he takes on WBC champion Vitali Klitschko next month.
The 28-year-old must overcome the odds to stun the formidable Ukrainian, who will square up six inches taller than his opponent, when they meet in Munich's Olympiahalle on February 18.
Klitschko has not lost in 11 fights since suffering a stoppage defeat by Lennox Lewis in 2003 but Chisora insists he can achieve the unthinkable.
"Vitali has been around a long time. He is the king of the sport, but it's about time that somebody came in who is young and fresh and I am going to 'whup' his ass," Chisora said.
"A lot of people have tried to stop him but they don't have the swagger and the passion to go in there and do the business that I have got."
Chisora lost his British and Commonwealth titles to Tyson Fury last year and was then defeated by Robert Helenius in Finland but says he has deserved his chance to meet Klitschko.
He added: "I am not scared. That's why I am going to be successful.
"Everyone is saying it's going to be the biggest fight of my career but that's just because he has been on the throne for such a long time.
"Maybe this will be the toughest test of his career."