On a sunny afternoon at Chicago’s Diversey Tennis Center, kids laugh as they practice their swings. Coaches call out with creative phrases like “Stand like the letter T!” and “Knuckles to your ...

The relationship between hours of practice and ability creates a paradox. An athlete may practice very specific skills that have a specific effect on their ability to execute those skills. What often ...

Rafael Nadal tennis skills, especially on clay courts, were unmatched; he won the French Open 14 times.