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The 55-year-old Brit clashed with the Samoan-born Tua in 2000 and picked up a unanimous decision victory to retain the WBC, IBF and IBO titles.
The former undisputed champ walked away with the ultimate bragging rights over the 'Baddest Man on the Planet' after he secured a sensational KO victory in the eighth round.
Lewis reflected on his victory over the 'hard-hitting' Tua by posting a throwback on Facebook in 2014.
And one eagle-eyed fan on Reddit spotted that someone asked the 'Lion' who hit him the hardest out of Tyson and Tua, with Lewis leaving a brilliant response to the question.
The former heavyweight boxer wrote: "Spent my time trying not to find out!"
Lewis, who is widely considered one of the best heavyweights in history, chalked up 41 wins, one draw and two defeats in his illustrious fighting career.
The boxing Hall of Famer retired from the sport in 2004 after sealing a stunning sixth-round TKO win over Vitali Klitschko the previous year.
"People seem to be genuinely surprised when I tell them [Holyfield] was my toughest opponent, not to be confused with my toughest fight, which was [Ray] Mercer, but when you really dive into why that is, it actually makes a lot of sense," he said.
"Holyfield, like me, has an extensive amateur pedigree that has served him well throughout his professional career.
"He started boxing at eight years old and was an Olympic bronze medalist in 1984. Before he moved up to the heavyweight division, he's a man that cleared out the cruiserweight division to become the undisputed champion, and arguably the best ever, in that weight class.
"That's a lot of experience and it's safe to say that by the time we met for the undisputed heavyweight championship in 1999, he had seen it all.
"When you combine Evander's amateur and professional experience, you would be hard pressed not to see the kind of success he's had in the ring.
"I may tease him a bit on our two fights, he knows I won both fights even though he won't admit it, but in all seriousness, he's the only man that has gone 24 rounds with me."
Featured Image Credit: YouTube/PA
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