In late 1988, Tyson fired longtime trainer Kevin Rooney, the man many credit for honing Tyson's craft after the death of D'Amato. Without Rooney, Tyson's skills quickly deteriorated and he became more prone to looking for the one-punch knockout, rather than using the combinations that brought him to stardom. He also began to head-hunt, neglecting to attack the opponent's body first. In addition, he lost his defensive skills and began to barrel straight in toward the opponent, neglecting to jab and slip his way in.

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