This is a case-study based on a follow-up survey on a subject named K.F. who had rapidly graded up the ranking order in a period as short as 8 months after entering a college but graded down the ranking order largely in the last year in college, in the senior year. We aimed at obtaining basic data which would guide in bringing up players, through an interview and a questionnaire concerning the causes for the failure in improving results in his last year at college. The results are as follows. We could not get a clear-cut evidence for the direct causes for degradation in competitive power in technical element, physical element, or in environmental element. We found a hint in psychological element such that (1) the player could not stand the pressure caused by attention from the surroundings, (2) and that the player was full of conceit as he had shown good results, (3) and that the player was too much conscious of the victory being too much occupied in keeping his good ranking. It was suggested that these factors aroused psychological and physiological tensions which prevented him from playing aggressively, possibly resulting in grading down the rank order. For the subject it was the first experience to advance in the high ranking to attract attention from the surroundings as a result. Moreover, the subject got those experiences in a short period of time. As a result, it seems that he could not find out how to cope with the situation. As a coach, when such a case is encountered, psychologically coaching the players against pressure seems necessary.