I'm of the opinion that you almost always don't get to 'full sprint' on a tennis court. It takes a bit to get to full sprint and in tennis you will usually start to 'check/reduce' your speed as you get to the ball.
e.g on a forehand/backhand you are pulled wide on, or on a dropshot if you are deep in the court, you will run but will slow down/get your footwork for the shot you are about to hit.
Can Andy Roddick win another slam?
"Computer says... Nooo"