By Carlos Boogs

A few days remained before Kell Brook, who holds the IBF welterweight crown, steps in the ring with IBO/IBF/WBA/WBC middleweight king Gennady 'GGG' Golovkin.

Brook is moving up by thirteen pounds to challenge Golovkin at the full middleweight limit of 160-pounds. The contest takes place at the on Saturday night at the O2 Arena in London. HBO and Sky Box Office will carry the event.

Promoter Eddie Hearn of Matchroom Sport, who handles Brook (36-0, 25KOs), feels a very good vibe in terms of getting an upset win. 

Hearn has been around both fighters during much of the fight week and he strongly believes that Golovkin is more nervous than Brook going in to this Saturday's blockbuster.

The fight with Brook will be Golovkin's first ring appearance in the UK. He's tried for several years to make his debut on British soil, but several of the opponents have fallen out. He was unable to secure potential fights with Carl Froch, WBO champion Billy Joe Saunders and British champion Chris Eubank Jr. After the negotiations to make a fight with Eubank fell apart and the slot opened up for September, Brook was more than happy to accept the deal and move up by two weight divisions.

"I'm getting my relaxed vibe from Kell Brook. He's the calmest person involved in this fight and he's the one fighting Gennady Golovkin," Hearn told BoxingScene.com's Declan Taylor.

"I don't know whether or not it's going to make a deference on that night, but I think Gennady Golovkin is more nervous than Kell Brook at this moment in time... new experience, new surroundings, but as well know this is a tough, tough fight."

"If you're in another country, if you're in another environment, you can never truly be at ease or at peace because you don't know what you're doing. The home surroundings mean a lot. And in a fight it could be 1% or 10%, but we need all the percents we can get in this fight."