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 already a top ranked contender, and after beating former and future world light-heavyweight champion Marvin Johnson by a knockout in four rounds, the WBA made Spinks their number one challenger, and so, on July 18 of that year, he met WBA light-heavyweight champion Eddie Mustafa Muhammad, once again in Las Vegas. Spinks dropped Mustafa Muhammad in round 12 and went on to become the WBA light heavyweight champion with a 15-round decision win. He defended the title once in '81, beating Vonzell Johnson by a knockout in seven. 1982 began with a knockout victory over Mustafa Wassaja. Spinks had become