There are expanding the base of amateur baseball with diverse factors and corporations are getting more interested in making opportunities to build relationships with customers by using this phenomenon. However, the previous research did not focus on examine practical effectiveness for relationship marketing methods as the strategy of the building relationship which was applied to sport events from diverse corporations. Therefore, the purpose of this study is to examine the practical effectiveness of the relationship marketing methods and the influencing process of the relationship marketing strategy applied to the amateur baseball. 150 players who took part in the amateur baseball tournament hosted by the on-line shopping mall company were selected for research samples with random assignment. To examine the practical effectiveness, 136 players' survey responses out of 150 responses were used for research data. For hypotheses testing, this study applied PLS structural equation model. This study presented that perceived face to face and listen as relationship marketing methods were significantly positive influenced on perceived relationship quality. In addition, perceived relationship advertising as relationship marketing methods were significantly positive influenced on perceived purchase intention. Moreover, perceived relationship quality was significantly positive influenced on perceived purchase intention. In the case of mediating effect with considering relationship quality, there was partial mediating effect for relationship advertising and face to face, and there was complete mediating effect for listen.
