Carlos E. Martinez is a professional tennis coach, performance consultant, and author whose work has taken him around the world alongside some of the game’s top athletes. His career in high-performance sport has given him a front-row seat to pressure, resilience, identity, habits, relationships, and the mental patterns that shape how people perform, and how they live.

With a background in science, systems thinking, and human performance, Carlos wrote By The Balls to explore a bigger question: why do some people grow through adversity while others remain trapped by the same patterns? Drawing from psychology, personal experience, performance environments, and years of observing people under pressure, he offers a practical framework for understanding yourself, navigating challenges, and taking greater ownership of the life you build.