If you play tennis seriously — or if you coach athletes who do — you already know there's something different about this sport. It isn't just footwork or topspin. It's that thing that happens at 5-4 in the third set when the body is spent but the mind suddenly gets sharper. That clarity isn't coincidence. It's biology. Tennis is one of the most neurologically demanding sports on earth. Every point demands split-second decisions, pattern recognition, emotional regulation, a