Kell Brook will be jumping up two weight divisions this weekend - from welterweight to middleweight - to take on Gennady Golovkin for the WBC, IBF, and IBO middleweight titles.
Entering this fight, the British boxer aims to emulate one of the best of all-time, Sugar Ray Leonard. The welterweight legend came out of retirement in 1987 and defeated world middleweight champion Marvin Hagler, who had been undefeated for 11 years.
With both boxers being undefeated - The Special One being 36-0 with 25 knockouts, while GGG is 35-0 with 32 knockouts - the current IBF welterweight champion knows it's going to be a tough fight, but he believes with his speed, footwork, and utilizing his fear, he can win the fight.
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He said according to BBC Sport: "I want to do what Leonard did with Hagler - use my speed, my footwork and box the perfect fight. I do fear him. Of course I do. I know he's a big puncher and that nobody wants to fight him for a reason.
"But the fear is positive because it's going to make me super-sharp with cat-like reactions. You could see the fear in Leonard's eyes when he was in with Hagler - that's why he was so sharp and zoomed in."
Despite the British boxer's confidence, some people are calling this fight a mismatch. Brook, however, believes he can be more effective in the ring at 160lb than what he was at 147lb.
The Kazakhstani boxer is regarded by some as the best pound-for-pound boxer in the world, so if The Special One was able to defeat him this weekend at The O2 Arena in London, it would be an even bigger upset than Leonard's victory over Hagler.