Michael Spinks turned professional with a win over Eddie Benson, knocked out in one round on April 17, 1977 in Las Vegas. With that, Spinks began a 31 fight winning streak that would almost extend to the end of his career. After four more wins, Spinks finished '77 with the first fight that began a gradual ascent in opposition quality: an eight-round decision over Gary Summerhays, a popular young boxer of the time. In 1978, Spinks won two fights, including an eight-round decision over former world Middleweight title challenger Tom Bethea, in the same undercard where his brother Leon dethroned Ali as
Leon Spinks Rico and knocked him out in round one. He then fought Scott LeDoux to a draw and defeated Italian champion Alfio Righetti by a decision. Now a lower-ranked contender, he made history on February 15, 1978, by beating Muhammad Ali on a 15-round split decision in Las Vegas, Nevada. Spinks won the world heavyweight title in his eighth professional fight, the shortest time in history. The aging Ali had expected an easy fight, but he was out-boxed by Spinks, who did not tire throughout the bout. It was one of the few occasions when Ali left the ring with a