Hauker is a four competitor at the Paralympic games winning a total of sic medals. His forst games were in 1984 Summer Paralympics where he competed in the long jump, shot putt, 100m and won bronze medals in both the 200m and 400m. Four years later in Seoul at the 1988 Summer Paralympics he won bronze again in the 200m and 400m and improved to win gold in the 100m. At the Barcelona games in 1992 he failed to win medals in the 100m or 400m but won a bronze in the 200m. His final games were in 1996 where he competed in the 100m, 200m and long jump but was unable to win any further medals.