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 to Norton. His second match with Ali, at the Louisiana Superdome on September 15, 1978, went badly for Spinks. A now-in-shape Ali—with better, sharper tactics—rarely lost control, winning back his title by a unanimous fifteen-round decision. Ali regained the title, becoming the first three-time lineal heavyweight champion. Spinks was never given a rematch; Ali retired after the fight (although he came out of retirement a few years later to fight Larry Holmes and Trevor Berbick). Spinks's next fight, his only one in 1979, was at Monte Carlo, where he was knocked out in the first round by future WBA world