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The left fielder's position is on the left side of the outfield behind the third baseman when looking at the field from behind home plate. The left fielder is part of a group of two other fielders that make up the outfield. Generally, outfielders act as a back-up to the infielders when they make plays or if the ball is hit past the infield. The left fielder must field their position, but also cover the area behind third base if a ball is thrown or hit in that direction. The left fielder covers this area in the case that the ball will pass the infielders. The left fielder can then prevent the base runner from advancing to unwanted bases. Besides covering certain areas of the field, the left fielder must be the smartest of the outfielders. In the left field position, the player has full view of the field, the players, the base-runners, and the batter. The left fielder must constantly be aware of the situation on the field and know what must be done in different circumstances. More advanced levels require the left fielder to be able to field the ball during "slap hit" situations by playing shallow. Left fielders must also play a role in any run down situation between third base and home plate or back up any plays that happen at third base in case of an overthrow.