In the context of the flourishing professional tennis leagues and the increasing prominence of commercial value, how to effectively cultivate and promote tennis players has become a focal point for the sports industry and the agency sector. Employing case analysis and literature review methods, this research delves into the training costs and income sources of tennis players, as well as the role of sports management companies in this process. The study initially points out that nurturing a top-tier tennis player requires substantial financial input. However, once the athlete achieves significant success, the returns are highly lucrative, primarily deriving from competition prize money, brand sponsorships, and revenues from commercial activities. Sports management companies, such as IMG, play a crucial role in the selection, training, and commercial promotion of athletes. Through their professional operations, they significantly enhance the commercial value of the athletes. The study provides a detailed analysis of how sports management companies systematically cultivate athletes and maximize their commercial value through diversified means. The findings indicate that the involvement of sports management companies is crucial for enhancing the commercial value and competitiveness of athletes. Addressing the current situation of training and agency management for Chinese tennis players, this paper proposes several recommendations, including improving the legal framework, promoting diversification in sports training, and implementing a "trinity" training mechanism, etc. These recommendations aim to promote the holistic development of Chinese tennis players and advance the standardization and professionalization of the tennis agency industry.