High Quality Content by WIKIPEDIA articles! Michael Spinks (born July 13, 1956 in St. Louis, Missouri) is a retired American boxer who was a world champion in the light-heavyweight and heavyweight divisions. Nicknamed Jinx, which spawned the nickname of his right hand: The Spinks Jinx, he is the brother of former heavyweight champion Leon Spinks, and uncle of Cory Spinks, a former welterweight and light middleweight champion.