David Haye believes he has Wladimir Klitschko "rattled" ahead of tonight's heavyweight mega-fight.

WBA champion Haye squares off against IBF and WBO title holder Klitschko in Hamburg, Germany in a unification showdown the Londoner has labelled "the biggest fight in boxing".

Interest in the bout at the Imtech Arena is huge and Haye was roared onto the scales at yesterday's weigh-in by the British supporters who have travelled to Germany.

Around 8,000 fans are heading over with tickets and those who arrived in time treated Klitschko - the home fighter in his adopted country - to a boisterous barracking.

"The support is great," Haye said. "Never before has Wladimir Klitschko been booed on the way to a weigh-in. That's the first time.

"It will be interesting to see how he deals with it. I thought he looked nervous. I rattled him.

"I'm afraid I can't repeat what I said to him in the face-to-face. It's unrepeatable."

Haye, 30, came in at a trim 15st 2lb 12oz, lighter than he has been for most of his fights at heavyweight and two stone lighter than Klitschko, who was 17st 4lb 8oz.

Haye's lighter weight could be interpreted as an intention to use elusive boxing tactics rather than an aggressive gameplan, but he suggested little should be read into what happened on the scales.

"There was no real fixed plan for my weight, but I wanted to be at my lightest, fittest and healthiest," he added.

"He's not used to someone as confident as I am or someone coming into it in shape like me.

"If you look at the last few of Wladimir's opponents they all come in with their stomachs hanging over their shorts and looking in completely and utterly disastrous condition before the fight has even started.

"So this is the first time he's actually fought a real athlete."

Haye is well aware of the size of the occasion and is enjoying the spotlight.

He told Press Association Sport: "This is the biggest fight in boxing, plain and simple.

"I think the only fight that could match it is Floyd Mayweather against Manny Pacquiao. Obviously for various reasons their fight has not happened, and won't happen this year, so this is the biggest fight to happen in boxing by far.

"I'm so proud to be involved in it.

"I believe being the unified heavyweight champion is the pinnacle of the sport and I'm looking forward to going in there and claiming my rightly deserved titles."

Haye's best chance of winning centres on Klitschko's apparently vulnerable chin.

But the 35-year-old Germany-based Ukrainian, who has a record of 55 wins, 49 knockouts and three knockout defeats, is happy to keep on proving the doubters wrong.

He said: "I've been called a dead man walking before. But this dead man keeps walking.

"And you know what? It's okay the way Haye talks and represents himself. I'll definitely enjoy the fight. It is time for the talking to end."

Klitschko is rightly the heavy favourite and all signs point to another win for the 6ft 6in powerhouse.

The common consensus is that Haye (25-1, 23KOs) must knock Klitschko out to take an upset victory, but with the right tactics the 30-year-old