This is not true. Bruno was certainly giving Lewis problems - not least because he possessed one of the best jabs in the heavyweight division. But whilst Frank was getting several good licks in - it's not as though Lewis wasn't catching him with a few of his own. Lewis was always a careful fighter and he knew that to get involved in a brawl with an explosive puncher such as Bruno courted disaster. Like Floyd or any other elite fighter he tightened up his defence and limited his risks until he got the measure of his opponent. He also knew that it was certain Bruno couldn't sustain the pace at which he was fighting and would eventually gas out - as he did in the Witherspoon and Bonecrusher fights.
No version of Tyson was unbeatable. None.
The invincible Lewis never existed. The invincible Tyson did, thus the difference in these parameters.
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