Actually this is a two part question. 1. What are some common club level weaknesses? 2. How to exploit them? I can think of several common club level weaknesses. 1. weak 2nd serve. 2. no backhand. 3. can't handle highballs. My way to exploit them are:- Weak 2nds, take the ball on the rise and hit it to the corners. Get to the net if well hit. No backhand, trade backhand to backhand and hope he misses. Can't handle highballs, feed them highballs every once in a while. Now please remember we are talking club level here so the way to exploit the weaknesses should also be club level. Of course I would like to just rip an inside-out forehand winner off a weak 2nd like the pros do but I can't.