I wouldn’t punch these type of balls normally, I would try to still play a backhand topspin stroke. To help you generate the power and speed on these medium high shots it’s important to coil the bat back and have a good back swing, this will allow you the space to accelerate into the ball, and give you more of a whipping effect. Also having a bit of tension right before the contact will help you get more snap and speed on the contact and get more speed through the shots. Dan
