By Edward Chaykovsky
IBF/IBO/WBA/WBC middleweight champion Gennady 'GGG' Golovkin (35-0, 32KOs) is very surprised with the physical transformation of IBF welterweight champion Kell Brook (36-0, 25KOs).
Golovkin will defend his belts against Brook on Saturday night at the O2 Arena in London.
Brook, who fights at 147-pounds, is heading up by thirteen pounds to the middleweight division.
Brook, who is viewed as the smaller man, has been consistently outweighing Golovkin during the WBC's mandatory weight checks - which surprised everyone including Golovkin, because the Sheffield fighter was still very much in shape with the added weight.
At the 30 day weight check, Brook was 176-pounds while Golovkin was only 165. And then Brook held a five pound weight advantage at the WBC's 7 day weight check.
The middleweight king is expecting the toughest fight of his entire professional career.
Golovkin told Sky Sports: "He came in a month before the fight at 176 pounds and then 167 pounds. My weight has been 165 or 163 but he's huge. He looks good. He looks strong and big. It's interesting. It's very serious and it's a huge fight.
"My first question to my coach was about [Brook having] different speed but he said no - just different size, different power and different timing. I thought 'Wow'. It's interesting. He's my biggest fight and my biggest challenge. It's my biggest step. UK fans are huge and crazy. I like the atmosphere.
"I feel great. I feel it's time to fight. I have two or three days and then I'll be feeling ready, 100 percent. I have to thank my coach, Abel Sanchez, who brought a new strategy for this. It feels great. I feel different and I feel good.
"I have a different plan and a more serious plan. Kell is a great fighter and I respect him. He's an undefeated champion from the UK with a great record. I understand it's not an easy fight for us so I'm more serious and more focused."
