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
William A. Spinks January 1909, just prior to an 18.1 balkline championship at Madison Square Garden (in which Spinks was not competing), he and Maurice Daly were observed playing practice games with Sutton for the latter's pre-event training, in Daly's billiard hall in New York City, on multiple occasions over a several-day stretch. While Spinks lost all but one of the recorded matches of this series, one loss was by a single point, at 400–399, and another was a close 400–370. His victory was 300–194 – surprising given that 18.1 was not his preferred game. Many articles of the era stress that Spinks