By Edward Chaykovsky

IBF/IBO/WBA/WBC middleweight champion Gennady 'GGG' Golovkin (35-0, 32KOs) is warning his upcoming opponent that he shouldn't be fooled by his nice guy demeanor outside of the ring.

This coming Saturday night, Golovkin defends three of his four belts against IBF welterweight champion Kell Brook (36-0, 25KOs), who moves up by thirteen pounds to meet GGG at the middleweight limit of 160-pounds..

The fight takes place at the O2 Arena in London. HBO and Sky Sports Box Office will carry the card.

With the fight only days ahead, Brook has been doing the majority of the talking. Golovkin is usually quiet and does very little in the pre-fight trash talking department.

He explains that a transformation takes place once he enters the ring - he becomes GGG. The personality of GGG has led to a 22 fight knockout streak. It has also led to Brook being listed as a sizable underdog with very few experts, including those in the UK, selecting him to come out on top. 

The fight with Brook will be Golovkin's ring debut on UK soil. He wants to continue coming back to the UK in the future - and because of that he intends to put on a real show for live audience.

"Outside the ring I am Gennady but when I get in I am Triple G, I become a different guy. I don't know how I switch but I understand my job, I understand the situation and I understand my business," Golovkin told BoxingScene.com's Declan Taylor.

"It is time, for what? For fighting. It's just my work time so I am there 100 percent focused on my opponent. I know what I have to do to do my job. Now I am ready for Kell Brook. And, because it's my first time here, I really want to put on a show."