Tyson's was a meteoric rise, as he burned through the amateur heavy circuits with a reputation for the knockout win. At just 20, Tyson was already fighting for the World Boxing Council championship against Trevor Berbick who — though older and more seasoned — could not handle Tyson's power. Berbick was knocked out in the second round and Tyson became the youngest heavyweight champion ever, quickly following up that feat by securing the remaining two major heavyweight belts. By 21, "Kid Dynamite" was indisputably the best fighter in the world.