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 who won middleweight gold. Leon would also serve on active duty in the United States Marine Corps from 1973 to 1976. Spinks also had a brief career as a professional wrestler in the 1990s, working for Frontier Martial-Arts Wrestling (FMW) and holding the FMW Brass Knuckles Heavyweight Championship in 1992. Spinks debuted professionally on January 15, 1977 in Las Vegas, Nevada, beating Bob Smith by knockout in five rounds. His next fight was in Liverpool, England, where he beat Peter Freeman by a first-round knockout. Later, he saw an improvement in opposition quality, when he fought Pedro Agosto of Puerto