He didn´t, was a draw. It was a close fight, could´ve gone either way type. No robbery as some Polish people claim.
Ike smashed Byrd in 8. I see a prime Tyson doing away with Byrd in about 6 or less. Much is made of Byrd's quickness and all that but a young Iron Mike not only matched his speed, but exceeded it.
Tyson cuts the ring very well and slays him in middle or late rounds. Byrd would put up a good fight imo though