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 only fighter to floor Spinks. It would be Spinks's first defeat in the professional ring, as well as his last, as he retired following the fight. Spinks had a record of 31 wins and 1 loss, with 21 wins by knockout as a professional. In addition to his success as a heavyweight, Spinks is generally considered one of the greatest light-heavyweight champions and fighters of all time. He was the only light-heavyweight champion to remain undefeated in the entire history of the division since its inception in 1903 (until Joe Calzaghe), as well as the only reigning light-heavyweight champion to