A lot of times when I'm in the boxes, I slice from the ground up, and place it in the opposite side to grab a point, esp. when my opponent is at the baseline. What type of shot is this. Do a lot of people do it? I can also slice it back so it goes up the line closest to me, but it's trickier. I've done it a few times at the baseline but haven't been able to put much power behind it. Any thoughts?