Former two division champion David Haye, who manages heavyweight contender Derek Chisora, believes his man will pull off a major upset when he faces Oleksandr Usyk.

The contest will take place on May 23, at The O2 Arena in London.

Usyk, the former undisputed cruiserweight champion, is taking part in only his second contest as a heavyweight.

Because of injuries, Usyk has only fought once since the fall of 2018, when he had his last bout as a cruiserweight and stopped Tony Bellew.

He made his heavyweight debut last October, in stopping late replacement Chazz Witherspoon, who took the fight on a few days notice and admits he was physically exhausted when the contest was stopped.

Chisora is one of the most dangerous opponents at the weight - and Usyk risks his mandatory status, under the WBO, which guarantees him a crack at unified champion Anthony Joshua.

"I think he's just made a mistake this time, he doesn't realise what Derek is about," said Haye. "He doesn't get what it's going to feel like when he's in there against a 120 kilo wrecking ball. He doesn't know what that's like.

"He can try and replicate it in sparring, but his coach won't allow the sparring partners to do what Derek is going to do to him, with 10 ounce gloves on the night. It's going to shock his system.

"It's going to be beautiful to watch, the same way it was beautiful to watch what Fury did to Wilder. It was amazing to see someone completely dominate when you thought it was going to go the other way and we're going to get that same thing."