The other day my tennis instructor told me when you're hitting an approach shot it should be DTL. I didn't quite understand why this was. Something about you can just move straight up when the ball is hit DTL, opposed to having to move diagonally when you hit a cross court shot. Wouldn't hitting DTL and staying to one side of the court allow for them to make a cross court passing shot? When they're running to get a DTL shot the highest percentage shot would be cross court, so wouldn't it make more sense to move to the opposite side of the DTL approach shot?