Why double play depth is important.

When a runner gets on 1B, it is critical that infielders get into double play depth if they do in fact CARE about the runner at 1st. There may very well be times that they don't care about the runner. But, in general, they need to move to double play depth if they value that runner.

Here's why.

The obvious reason is if the ball is hit on the ground, the middle infielders need to be near the bag. The ball will first be thrown to one of the middle infielders so a closer position to the bag is essential.

Also, if the runner takes off to steal 2nd, the middle infielder that is covering the bag should move "in then over." If he's in double play depth he won't have to start running to the bag too early. He can hold his ground and not give up his position too quickly as long as he's in double play depth.

Double play depth is also important in case the runner steals and the catcher receives the ball. If the middle infielders would not be "shortened" up they would more than likely be on the run when the ball arrives at 2B. Double play depth allows the middle to be closer to the bag and therefore awaiting the ball as it arrives at 2B. In addition to the straight steal, the delayed steal becomes an option when middle infielders move away from second base.

It would be nice if the middle infielders would not have to give up their range when playing the position. However, that man on 1st base dictates otherwise. Now, if you're lightning fast and can get to places that others can't, then you can create more depth with your positioning.