I often see people hit the ball too early, myself included. We can’t or more often won’t wait until the ball enters our “strike zone” before going after it. While attacking the ball is commendable, you have to move up and get right behind the ball to give it lift and power. If your feet stay planted and you reach forward with your racket without sliding up to the ball (preferably sideways all the time), then you will make contact too far in front of your hip. This early contact will usually cause the ball to go straight into the net. Instead, take adjusting steps and slide up behind the ball. This will keep your contact point and balance in the optimum spot so that you can pound those groundies past your staunchest adversary.