Batted Ball Direction represents the horizontal direction at which the ball leaves a player's bat after being struck. Average Batted Ball Direction (aBBD) is calculated by dividing the sum of all Batted Ball Directions by all Batted Ball Events.
As a guideline, a direction of 0 degrees is a ball hit to straightaway center field. A positive direction is a ball hit to the right of center, and a negative direction signifies a ball hit to left of center. If a batted ball is hit directly down the right-field line, it would have a batted-ball direction of 45 degrees. Conversely, a batted-ball hit directly down the left-field line would have a batted-ball direction of -45 degrees.
Average Batted Ball Direction can show whether a hitter is more prone to pulling the ball or hitting it to the opposite field. For example: A right-handed "pull" hitter, who hits a high percentage of batted balls to the left side of the field, would have an Average Batted Ball Direction in the negative degrees. Conversely, a right-handed hitter with a propensity to hit the ball to the "opposite field" (right field for him; left field for a left-handed hitter) would have an Average Batted Ball Direction in the positive degrees.
Watch: Statcast measures the Batted Ball Direction for Kyle Seager's double.