I heard of a concept once upon a time that talked about figuring out where your opponent's "wheelhouse" is as far as number of rallies, and then preventing him from reaching it.
If your opponent can comfortably hit a 10 shot rally, then he's probably got a window of "comfort" between 6 to 10 shots. If he's there, he feels confident. He may not like when you try to end the point early, and he may not like it when the rally goes beyond 10 shots. So try for that.