USTA Player Development Library
View isolated strokes of the best players in the world, including Rafael Nadal, Andy Roddick, Serena Williams, Maria Sharapova and more. 73 players in all.

Tennis.com Video Instruction
A wide assortment of instructional videos grouped by Forehand, Backhand, Serve, Return of Serve, Net Game and Strategy. They also have instructional articles that adds topic groups such as Doubles, Drills and Grips.

Fuzzy Yellow Balls
Get ready to LEARN HOW TO PLAY TENNIS FOR *FREE.* Fuzzy Yellow Balls is a site where tennis players from across the world come to learn how to play tennis online for free, discuss the sport and socialize. The content of this website is both exclusive and incredibly unique, combining the expertise of some of the Washington, DC area’s top tennis pros with innovative teaching technologies and strategies.

Essential Tennis
Instruction for people who love tennis. Has videos, pocasts, blogs and forums about tennis. Every Monday a live podcast is held where you can have your questions answered.