Roger Federer and Juan Martin Del Potro
Tall people use their height to cover the court and serve fast. If they are adept at running, they can get to SHOT AFTER SHOT. The only problem is that they use up a lot of energy trying to organize their long bones. So if they are at all clumsy, they feel it after a while.
Groundstrokes
Maria Sharapova
Notoriously, professional tall players have some notoriously booming flat strokes. Sharapova, Safina, Del potro, Berdych, and Soderling are proof of that.
At the lower level, tall people aren't really predisposed to hitting the ball that hard. They often learn their strokes all by themselves. They quickly realize that their height allows them to get to every ball. So it is often a mixed bag. Some hit soft spins, some tap the balls flat. They just do what they think makes them win. But if they ever get it together with the groundstrokes, it poses a big firepower issue for opponents.
Serve
The serve is a different matter. Tall men tend to hit the serve over 100 mph with regularity at a low level. The second serve is usually, considerably slower and weak. If a tall guy learns a kick serve, that is potentially trouble because his kick will bounce very high.
Volleys
Tall people can stand close to the net because they can cover lobs so well. So you might get a lot of drop shots falling on front of the net. Just getting a racket on the ball for the rest of us might hit it into the net. But for them...drop volley winner. If you are playing doubles, just try to exploit them before they get to the net.
Footwork
Gael Monfils
Most of the time. An untrained tall person is a little clumsy. They might really favor one stroke over another. If so, you have a chance to wear them out. Making them reach forward on balls coming right to them might create a good opening. Stretching them out might not help too much.
Strategies
Tall people normally bring a FIRST serve. But the rest of the game is a mixed bag. I've found that at up to a 4.0 level, you will still see tall players with big wholes in their game. Look for the obvious ones and find a way to match your strengths with them. If you can't find a weakness, hang in there, it might only appear when things are tense.
