Spearmon represented his country internationally over 200 m several times.[5] His first international medal came at the 1986 Goodwill Games, where he was a bronze medallist close behind fellow American Dwayne Evans, making it a sweep for the United States as Floyd Heard topped the podium.[6] A year later he won two gold medals at the 1987 Summer Universiade in Zagreb. First, he defeated Heard to win the 200 m title, and then the pair teamed up with Lee McRae and Lorenzo Daniel to secure the 4×100 m gold medals. The relay win was the start of a long winning streak for the United States in that event, which lasted until 2001.[7]
He had a son – Wallace Spearmon Jr. – in 1984 and encouraged him to also take up track sprinting. He coached his son for a long period and continued on as mentor.[11][12] His son ultimately bettered his father's achievements by winning three individual medals and a relay gold at the World Championships in Athletics, in addition to a national record indoors in the 200 m.[13]