This study compared and analyzed the differences in playing styles and tactics between Japan’s professional basketball league, the “B.LEAGUE,” and the United States’ professional basketball league, the “NBA,” using performance data from the top 8 teams in the 2023-24 regular season from both leagues. Specifically, the study conducted a detailed comparison of offensive and defensive characteristics and clarified the factors contributing to win rates through correlation analysis. In the NBA, block shots (BS), three-point field goal percentage (3FG%), and defensive rebounds (DR) were strongly correlated with win rates, indicating that physical defense and individual player abilities significantly impact game outcomes. On the other hand, in the B.LEAGUE, field goal percentage (FG%), three-point field goal percentage (3FG%), and assists (AS) contributed to win rates, emphasizing the importance of tactical coordination and efficient team offense. Additionally, the B.LEAGUE exhibited a unique characteristic where free throw percentage (FT%) showed a negative correlation with win rates. The comparison between the two leagues revealed that the NBA prioritizes individual skills and physical play, the B.LEAGUE relies heavily on team play and organized tactics to influence game outcomes. These findings provide concrete suggestions for the tactical development and performance enhancement of the B.LEAGUE and offer valuable insights for increasing audience engagement and advancing the growth strategies of the league as a whole.

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“Coaching” has different meanings in sports and business. In a sports context, it is used as a broad concept that refers to all the coaches guiding players to achieve the desired results. The primary focus being guidance on techniques and tactics. In the business sector, coaching pertains to personal support aimed at achieving the client’s goals and involves awareness, learning, and voluntary action through dialogue based on equal relationships. Given the effects of personal coaching, it could be assumed that it would have a positive effect on athletes. Since it is known that there are only a few recorded cases of practicing and studying personal coaching for athletes. Therefore, this study explored the effect of personal coaching on athletes. This study investigated the effects of personal coaching on 14 elite athletes (eight men, six women). A semi–structured interview survey was conducted to examine the changes (competitive, psychological, and social) caused by the personal coaching. All recorded interview data were transcribed verbatim and analyzed using a Modified Grounded Theory Approach. Fifty concepts were consequently extracted, and the process that led to competitive results was modeled through personal coaching awareness and verbalization, behavior change, psychological effects, and performance improvements. Secondary effects, such as human growth, self–coaching improvement, application to sports coaching, and career design advancement, were also confirmed.

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