Mike Tyson says Anthony Joshua could be in for a shock if he fails to take Wladimir Klitschko early on.
Joshua defends his IBF world title against Klitschko at Wembley tonight and the WBA and IBO belts are also on the line.
But former undisputed world champion, Tyson, says that Joshua will need to destroy the Ukrainian fighter in the early rounds to avoid a loss.
Iron Mike told Sky Sports: "In my mind it's got to be Joshua early on, and I hope he does it. but if it goes late it could be Klitschko.
"I am looking forward to this one.
"I'm excited we are going to get to see Joshua. He is just a beast - a big beast."
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Credit: PA
Tyson, who will be watching the fight from the US, also compared 27-year-old Joshua to heavyweight legend George Foreman.
He said: "Joshua reminds me of a young George Foreman.
"He is just wrecking anyone that's in front of him to get to the top. He is demolishing everyone."
Joshua has won all 18 of his professional fights by knockout compared to 41-year-old Klitschko's staggering 53 KO victories.
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Tyson Compared Joshua to George Foreman (Credit: PA)
HBO are joining Sky in showing the bout live in the US, making only the third fight in history to be seen on both American channels.
The first saw Lennox Lewis defeat Mike Tyson in 2002 while the second was 2015's 'Fight of the Century' between Floyd Mayweather and Manny Pacquiao.
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Joshua will be bringing something into the ring with him tonight that he's hoping to bring him a bit of luck in front of the 90,000 spectators.
The Londoner has added his 18-month old son, Joseph's name to the lining of his boot, the Mirror reports. His other boot will be inscribed with his niece's name - Angel.
Credit: BBC Three
Joshua lives in the former council flat he bought for his mum, in north London.
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He also reportedly bought a £500,000 penthouse in nearby Finchley for the mother of his son, Nicole Osbourne, and his little boy.
Earlier this week, Joshua showed off his generous nature by surprising his old coach with a brand new car.
Rocking up to Finchely ABC boxing club, where it all began for Joshua, he found his former coach Sean Murphy and presented him with a brand new BMW.
Topics: Mike Tyson, Anthony Joshua, Boxing, Lennox Lewis