Frazier's style totally centered around the fact that he couldn't straighten out his left arm, due to badly breaking it as a child and having it heal funny. He could throw nothing but a hook with that hand. This, along with the fact that he wasn't particularly tall, forced him into the style we all know him for.
Tyson normally fought from a peekaboo stance, and relied on a combonation of parrying and head movement to avoid punches. In his prime, he was far harder to hit than Frazier, who was never particularly hard to hit. Frazier could get away with it because he was insanely durable - the only person who ever put him down for the count was George Foreman, without a doubt the most powerful puncher of his generation.
Tyson fought with a very traditional style, due to the fact that Cus D'Mato was an old school guy. Remember, Cus was always annoyed by Ali's style as he felt that Ali wasn't using proper defense.
Tyson's problems weren't his style of fighting, but rather that he became very complacent in his training. He did literally no training whatsoever for the Buster Douglas fight. The closest thing he got to training for that fight was doing a little light sparring for the press. Tyson was so out of shape that his sparring partner knocked him down. Later in his career, after he served time in jail, he just slowed down. He always relied on being a lot quicker than his opponents, but when he slowed down he never adjusted for it. Somewhat simmilar to what happened to Roy Jones, although when Roy hit the wall he hit it hard and fast.
Brian.
