Many players don't know when to use the overhead or to use the swinging volley. This is a good drill to prepare them and help them feel comfortable, rather than panicky when they encounter these opportunities to win a point.

Have player stand about halfway between the service line and baseline. Feed the player identical high balls, forehand and backhand. As you feed, call out "overhead" or "swinging volley." The player will then have to adjust her footwork and position in order to hit the correct stroke.

The benefit of this drill is that the player will cease thinking about where she is and get to where she should be to hit the winner.