Cory Spinks welterweight titles in 1997. Spinks went 29-2 in his first 31 contests, only losing to Antonio Díaz (regarded as a controversial decision by some boxing analysts and ringside observers) and Michele Piccirillo, whom he defeated by decision in a re-match. However, Spinks rose to boxing stardom by unifying the WBC, WBA, IBF, and "The Ring" and lineal welterweight titles on December 13, 2003, when he defeated Ricardo Mayorga by majority decision. Spinks was a 5 to 1 underdog going into the fight with Mayorga. The judges scored the fight 114-112, 117-109, 114-114, favoring Spinks. Spink' first Welterweight title defense came
Michael Spinks and narrow fifteen-round unanimous decision and becoming the first ever world light-heavyweight champion to win the world heavyweight title. His controversial victory over Holmes was named "Ring Magazine" Upset of the Year. With this, Michael and Leon had also become the first pair of brothers ever to be world heavyweight champions, followed two decades later by Wladimir and Vitali Klitschko. In 1986, Spinks and Holmes fought a rematch as part of the heavyweight unification series, and had nearly the same result, this time Spinks winning by a 15-round split decision. After that, he retained the world heavyweight championship once again,