This guy called Qureshi who got to 125 singles in the world says you should decide what serve to hit before getting to the line
http://youtu.be/8sQtsmS4zIU?t=2m11s
I always thought you decide what serve to hit when you were at the service line based on e.g. where your opponent was standing, weak side, last serve etc.
Am I wrong? Sounds like it
I'll go one step farther and say that you should plan the shot after the return to the extent you can:
- deuce court wide serve, look for a ball you can put into the away corner with an inside out forehand.
- deuce court wide serve, look for a ball you can hit behind a recovering player
- deuce court up the T, serve and volley with a firm punch volley deep down the middle
- deuce court up the T, look for short ball in middle you can hit with a forehand to opponent's backhand corner
- ad court kick wide, serve and volley with sharp angle volley to open court
- ad court kick wide, serve and volley with punch volley down the line
Obviously, it doesn't always work that way, but it's what elite players do. They've already got a pattern in mind, and they're looking for the next ball after the serve and return.