Most of the time outfielders play at about the same depth, but in some situations you may want to move them. Playing outfielders deep prevents extra-base hits, because hitters will not be able to hit the ball over or past the outfielders. Against extremely weak hitters, playing shallow may prevent a bloop single. Consider playing very shallow when a game is tied and you have to prevent a game-ending run scoring from third. The shallow fielders will catch balls that would normally fall in for singles.
Some managers like to guard the lines late in a close game.
They'll give away a single if it means preventing a groundball double down the line. Shift infielders left or right if your pitcher is a hard thrower. For a more radical shift, use extreme left or extreme right if you're certain about the direction the ball will be hit. Outfield shift to the left, right, extreme left, or extreme right, depends mainly on the hitter at the plate and the pitcher on the mound. In some situations, however, you might choose to guard the lines, or pinch your fielders closer together to guard the alleys between the outfielders, depending on the hitter.