International Book of Tennis Drills: Over 100 Skill-Specific Drills Adopted by Tennis Professionals Worldwide
Professional Tennis Registryis the largest global organization of tennis-teaching professionals with more than 14,000 members in 117 countries. They are dedicated to educating, certifying, and servicing tennis teachers and coaches around the world in order to grow the game of tennis. They are based in Hilton Head, South Carolina.