Mike Tyson might not know who will win the Errol Spence vs. Terence Crawford fight, but he is sure of one thing ... it's definitely ending in a knockout.
TMZ Sports got Iron Mike's prediction on the massive match just before the two star boxers officially square off Saturday night at T-Mobile Arena in Las Vegas ... and he seemed to kind of like Bud to win it.
Then again, he wasn't super confident about it all ... telling us a recent talk he had with Spence was changing his mind a bit.