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
Michael Spinks twelve-round majority decision over Eddie Davis. He and Qawi were only a couple of weeks away from fighting a rematch in September of that year, but that fight got called off when Qawi was injured during training. Spinks also was recognized as IBF Light heavyweight champion in 1984. In 1985, Spinks beat David Sears and Jim McDonald, both by knockout, in title defenses, before challenging Larry Holmes for the IBF and lineal heavyweight championship. Holmes was trying to tie Rocky Marciano's record of 49-0 as the heavyweight champion, but it was Spinks who made history that night, winning a controversial