The most common type of double play occurs with a runner at first and a ground ball batted towards the middle of the diamond. A defender with the ball steps on second before the runner from first arrives to force one out, and then the ball is relayed to the first baseman to force out the batter. Other types of double plays occur when fly balls are hit to the outfield and caught, but a runner on the basepaths strays too far away from his base. If the ball is relayed back to that base before the runner returns or tags up to go to the next base, the runner is out along with the batter for a double play.