The emerging literature suggests that mega-sporting events have the potential to negatively impact local ecosystems by causing pollution and waste accumulation. This has raised the issue of “green sports,” which is a critical one. This study attempts to contribute a model to the design process to identify factors that attract spectators to sports, provide insights into the dynamics of mega-sporting events, and present a set of sustainable products that could interest sports-goers. A baseball game was selected as an example of a mega-sporting event. The study employed a combined model of the design process for product innovation, which included two in-depth qualitative interview methods: the evaluation grid method and a user journey map. A set of products designated as the “HOMERUN” set were designed based on the findings of the combined model. The result illustrated the possibility of transforming product features to meet users’ needs at different stages of the mega-sporting experience. The model applied in this study has implications for transforming product design thinking from a focus on specific points in problem solving to a linear pattern that focuses on a broader picture.