Who hit their head on the high dive during olympic competition?

At the 1988 Summer Games in Seoul, Greg Louganis' head struck the springboard in the preliminary round of the three meter springboard diving competition while attempting a reverse 2 1/2 in the pike position. The resulting cut required stitches. Louganis qualified for the finals and became the first diver in Olympic history to defend an Olympic springboard title when he won the gold medal.