He won a silver medal in the 1988 Summer Olympics in the 400 meters and a gold medal in the 4 x 400 m relay. In the IAAF World Championships in Athletics he won a bronze medal in 1987, and silver medals in 1993 and 1995. He also won gold medals on the 4 x 400 meter relays in 1987, 1993 and 1995. The 1993 World Championship team with Andrew Valmon, Watts and Johnson still holds the world record for the relay.