The purpose of this paper is to examine Lenk's argument against the existential interpretation of sport by Slusher and to make clear the problem of existence in sport philosophy by Lenk. We considered Lenk's criticism toward Slusher's interpretation by paying attention on two points: one is the one-sidedness of the existential interpretation of sport, and the other the ambiguousness and inconsistency of technical terms (especially, “being” and “authenticity”) used by Slusher. In spite of those criticism, Lenk suggests to make an issue of existence is important. In order to approach the problem of existence in his sport philosophy, we have adopted three perspective of existence: property, freedom and transcendence. They have led to the conclusion that they are connected with the concept of performance. We considered the subject from Lenk's viewpoint of existential experience. Our consideration shows that life is aesthetic. We may, therefore, reasonably conclude that the problem of existence in his sport philosophy is related to a self-fulfillment and an affirmation of one's own life caused by sport.