MIKE TYSON struck fear into the hearts of heavyweights for the best part of two decades.

‘Iron Mike’ burst onto the scene in the 1980s, making his professional debut in 1985 against Hector Mercedes.

Mike Tyson is widely regarded as one of the best heavyweights of all time

Joe Egan was shocked by Tyson’s physique as a teenager
‘Kid Dynamite’, as he was known back then, racked up an incredible 12 first-round KO finishes in a mere eight months to put the division’s old heads on notice.

That incredible run of stoppages made Tyson’s future opponents fear for their safety before the opening bell rang.

But he was an intimidating force long before he made his professional debut under the watchful eye of former mentor Cus D’Amato.

Irish hardman and now-retired boxer Joe Egan learned first-hand of Tyson’s ferociousness when he sparred the boxing icon as a fresh-faced teenager.

And their wars in the gym live long in the memory.

He told talkSPORT: “I’d left school when I was 14 years of age and I’d been on the doors of nightclubs at 15 years of age.

“When I met Mike I was 17 and I had been fighting men so when I got the opportunity to spar another 17-year-old I was over the moon.

“Mike was several months younger than me, he was shorter than me and he spoke with a bit of a lisp and I thought ‘I’m going to batter this kid’.

Tyson was in ripped condition from such a young age
“I really had the measure of him in my mind, he was so nice, he was fascinated with the history of Irish boxing so we got on great.

“We walked and talked, we watched fight footage at the top of the house together and then we ran together the next morning.
‘Bully boy thug’ John Fury called out by fighter Mike Tyson once called ‘toughest white man on the planet’

“When we got to the gym, suddenly all these big powerhouses appeared, all of them very sombre because they knew what was coming.

“They knew the beatings that were going to be dished out by this young heavyweight. I thought they’re all going to box together and then me and Mike are going to box together.”

Egan knew he was in trouble when he got a glimpse of Tyson’s hulking frame, which most fully grown men would’ve envied.

He continued: “We stripped off, shadow boxed, bandaged up and Cus said ‘glove up’. Then I saw Mike in the ring stripped to his waist.

“The physique on the 17-year-old boy, the biceps, the triceps, the neck, the chest, the back.

The physique on the 17-year-old boy, the biceps, the triceps, the neck, the chest, the back. I thought ‘there is no way a 17-year-old boy should look like that’.

Joe Egan On Mike Tyson

“I thought ‘there is no way a 17-year-old boy should look like that, that’s not the same boy I ran with this morning and met yesterday, that’s not the same boy I sat with on the mini bus, laughing and joking’.

“Then Cus pointed to one of the big men to get in and spar, he was knocked spark out with one punch. I’m not ashamed to say it, but I ruined a good pair of underpants in that moment.

“I s*** myself. Two more got in, two more got knocked out. I was number four, I got battered for three minutes, but I stayed on my feet.

“I got out, a couple more got in, they lasted as long as they lasted, I got in again. I did six minutes with him that day and took six minutes of punishment.”

Despite never getting the better of Tyson in sparring, Egan has fond memories of their time together.

“He said: “I never got the better of him, he battered me many times, made me cry so many times.

“But it was an honour and privilege to share the ring with him because of what he went on and achieved.”

Tyson 57, will be back in action on July 20 when he throws down with Jake Paul in a controversial crossover clash.

Egan, meanwhile, has been itching to get in the ring with John Fury – the father of former WBC heavyweight champ Tyson.