Originally Posted by pvaudio
This is not a fair comparison. The power generated here is from the amount of torque you can generate. A one handed stroke will generate more torque. The problem is whether or not you are able to generate it due to your technique. In golf and baseball, you can't accelerate the equipment with one hand because what you're using has an enormous moment of inertia (the club head or the end of the baseball bat). In tennis and other racquet sports, this does not apply.
try swing a modern driver with superlite shaft, doesn't feel much different from a tennis racket.
on the other hand (no pun), with 2hbh you have this leverage thing between the 2 hands.