Anthony Joshua’s sparring partner Marko Milun believes that the Briton will overpower Oleksandr Usyk on Saturday.
Joshua and the 34-year-old Ukrainian WBO mandatory meet on September 25 at the Tottenham Hotspur Stadium with all four of the IBF, IBO, WBA and WBO belts on the line.
A technical approach from the smaller, former cruiserweight champion Usyk is expected, and Milun agrees with the consensus that Joshua goes into it with the upper hand.
Milun was speaking via the Betway Insider blog, and explained: "In the ring, Joshua is very clever and smart. He knows what to do and he does it in the right way, he does everything in the right way.
“I grew a lot in the time I spent with him, learnt a lot of things that I did not know. Working with Angel Fernandez and Joby Clayton, they made me a little better.
"AJ for me was very surprising, he was very humble. He was like a guy from the local club, not the heavyweight champion, he spoke to us like a normal person. That surprised me.
The Croatian believes that he was picked as he matches the style adopted by Usyk in the ring.
"I think he chose me and other amateurs as sparring partners because he needed guys similar to Usyk,” he said.
“Usyk fights like an amateur boxer more than a normal professional and maybe that’s why he wanted me and Viktor Jurk and other amateurs, the only professional in camp was Shokran Parwani when I was there.
Milun is confident that Joshua will be able to convincingly win against the more technical fighter, in part because of his size and strength advantage.
"I saw in camp that AJ is really smart and he does the right things and I think he'll win this fight,” he said.
“Usyk is also smart but I think AJ has better qualities; he’s bigger, stronger and can punch harder. He has worked hard for this and I think he’ll beat him. AJ will be at home, the crowd will be behind him and my prediction is AJ will win comfortably. But I will tell you that this will be a smart fight, not a war."
Joshua vs. Usyk will air live on DAZN in over 170 countries. Check here to see if your country is one of them.