This gets back to basic strategy (strategery. . .I loved that word from SNL), which is to find your opponent's weakness, and pray on it. For s'n'v, they can be destroyed in any number of ways:
- if they're a step slower getting to the net (due to serve motion, age, weight, etc.), then chip the return cross court. It will be by them before they're to the net, due to that one step delay getting to net.
- play dipping cross-court angles. This will frustrate them, and eventually they will start to look for it. At that point, gently push it up the line for a winner. I will hit gentle winners all day long, as that will infuriate an opponent. It makes them think that you're easily beating them.
- dip it to their feet. This works especially well with taller players. You want them to crowd the net. When they do this, lob. Do this a lot, so that they start to back off of the net. This will open up more angles for you to work with.
- nothing wrong with going right at the body every now and then, especially with aggressive s'n'v. Keeps them in check. If you can generate hot speed on the ball, one of these should send the right signal. I rarely do this, but sometimes it can be fun, especially against someone you don't much care for.
- work on down-the-line topspin lobs. Works especially well on their BH side. Very few players have a strong BH smash.