Englishman David Haye attempts to become a unified world heavyweight champion when he puts his WBA belt on the line against IBF/WBO holder Wladimir Klitschko next week.

We have predictions on the fight from 10 expert observers.

Tyson Fury, undefeated British heavyweight, former Klitschko sparring partner

Prediction: Klitschko KO"I'm picking Klitschko to win by knockout, because of his size, his power and his speed. He is just the better man in every department."

Monte Barrett, former Haye and Klitschko opponent

Prediction: Undecided

"It's a toss-up. This is a hard one for me. If Haye gets past the jab he will stop Wlad within seven. Or, Wlad will stop Haye in four."

Ross Puritty, beat Klitschko in 1998

Prediction: Klitschko TKO

"I think that Klitschko will win by technical knockout in the ninth round. He is too strong and uses his jab well."

Matthew Macklin, world middleweight title challenger

Prediction: Haye KO

"I fancy Haye to win big time, I think he'll do it inside five rounds. The first few rounds will be very cagey, like the Audley Harrison fight, because whoever lands cleanly first...the fight is over."

Ashley Theophane, British light-welterweight champion

Prediction: Haye KO

"David will win by knockout around the middle rounds of the fight. David will have his tactics spot-on, with his skill, speed and power. I am confident he will leave Germany with all four belts."

Jim McDonnell, trainer of James DeGale, former trainer of world heavyweight title challenger Danny Williams

Prediction: - Klitschko KO

"Haye has immense power and is faster, but he's only a cruiserweight while Wladimir is a genuine big heavyweight. This is his first proper test at heavyweight. He has a puncher's chance, that's all."

Kevin Mitchell, lightweight contender

Prediction: Haye KO

"It's a tough fight for the pair of them. It's a 50-50 fight. If David doesn't knock him out early, he'll get taken out himself. But I think his hand speed and power will be too much for Klitschko."

James DeGale, 2008 Olympic champion

Prediction: Klitschko points

"You never know because David Haye can bang and he's quick. But if it goes past six rounds, I think Haye won't get the decision in Germany moving around, especially against Klitschko."

Matthew Hatton, former WBC light-middleweight title challenger

Prediction: Haye KO

"I think he'll win the fight, he has speed, power, he's explosive and I predict he will take him out early."

Darren Barker, world middleweight title contender

Prediction: Haye win

"I fancy Haye but any result will not surprise me. Haye's speed could be a key factor."

Tags: Matthew Hatton , Wladimir Klitschko , David Haye , Klitschko-Haye , Klitschko vs Haye , Matthew Macklin , James DeGale , Ashley Theophane , Tyson Fury , Darren Barker , Monte Barrett