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 heavyweight champion Gerrie Coetzee. In the following fight, Spinks defeated former world title challenger and European title holder Alfredo Evangelista by a knockout in round 5. He fought to a draw in with Eddie López, in May 1980 he scored a knockout over Kevin Isaac, and in October beat the WBC's top-ranked challenger, Bernardo Mercado, by a knockout in round nine, this fight was on the undercard of Muhammad Ali vs. Larry Holmes. His strong performance against Mercado earned Spinks a title match against Larry Holmes. In Spinks' only fight in 1981, and what would be his last opportunity to