This book LNCS 15925 constitutes the refereed proceedings of the Second International Conference on Sports Analytics, ISACE 2025, held in Shanghai, China, during September 26-27, 2025. The 21 full papers were carefully reviewed and selected from 57 submissions. These papers explore the frontiers of sports analytics, which is an interdisciplinary field that integrates artificial intelligence, data science, psychology, and smart devices to enhance athletic performance, strategy, and decision-making.