Choi, Jinyong2018-02-232018-02-232017http://hdl.handle.net/10657/2298The shapes in the beginner group are relatively moderate than other groups. Some similar shapes are found in the intermediate group while extremely sharp shapes appear in the advanced group. I believe the reason that advanced player's shapes are sharper is they understand well about a racket and they choose a racket in a way of maximizing their preference between control and power.en-USPoster