Answer:
An invention that I thought of would be strings in a tennis racquet that would analyze the players stats of how they were hitting the ball, how much speed was on it, impact timing, amount of area covered, placement of where the ball was hit, tension of how tight the strings are, and how much movement was on your string. These strings would be bluetooth, so when you would want to see your progress you would connect it up to your computer and open the app that shows all your information with a sample racquet on screen for more visual effect. Yes, strings pop and so will these, but it would be the same price as any other string ($17 per set). The person who would sponsor this would be Rafael Nadal, current world #1 tennis player. He would sponsor it because he is always looking for a way to improve and help other tennis players improve. He likes to see what he is doing and what he can do to improve it. He is sponsored by the company Babolat so they would manufacture the strings for him.
Hopefully this was what you were looking for!
Let me know if you need any additional information.