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Home of the most in-depth defensive analytics in baseball


We are excited to announce that we have updated our flagship stat, Defensive Runs Saved, to account for where an infielder was positioned. This is our biggest enhancement to DRS since The Fielding Bible IV in 2015. This update has been applied to DRS numbers going back to 2013.

Introducing the new PART system, which separates positioning (P) from an infielder’s ability to field balls hit in the air (A), his range (R) and his throwing success (T).

We are transitioning from evaluating “how often did a player make that play?” to “how often did a player make that play given where he was positioned?” We are interested in evaluating an infielder’s range skill from his starting point. Thus, the Positioning component is not included in the player’s Defensive Runs Saved total.

Additionally, this system evaluates all infield plays, not just ones involving an unshifted defense. These changes gain significance given the dramatic changes in player positioning in the last few years (with significant increases in defensive shifting).

The new PART system will allow for a more accurate representation of an infielder’s defensive performance.

Components of Defensive Runs Saved

  1. ART – measures infielders’ performance on balls hit in the air, range, and throwing success *NEW*
  2. Range and Positioning System – measures range and positioning for outfielders
  3. OF Arm Runs Saved – measures outfielder arms
  4. GDP Runs Saved – measures double play ability
  5. Bunt Runs Saved – measures ability to field bunts
  6. Good Play/Misplay Runs Saved – measures the run impact of good plays and misplays that are not accounted for in other components of Runs Saved
  7. Catcher Stolen Base Runs Saved – measures the catcher’s ability to control the running game
  8. Pitcher Stolen Base Runs Saved – measures the pitcher’s ability to control the running game
  9. Adjusted Earned Runs Saved – measures the catcher’s handling of pitchers
  10. Strike Zone Runs Saved – measures the number of extra strikes drawn by a catcher because of his framing ability
  11. Shift Runs Saved – Measures team’s ability to defend when using a defensive shift

Click here if you are interested in learning more about our update to DRS

Here’s a grid showing which methodologies are used for which positions:

Want to know the leaders in Defensive Runs Saved for every year going back to 2003? Simply Click Here or the graphic below

In-Depth Player Pages:
Curious how good Matt Chapman is at fielding balls hit down the line? Check the numbers out here.

How about Mookie Betts’ year-by-year Defensive Runs Saved total? You can find that here.
"John Dewan's Plus/Minus System is the best statistical system I've ever seen for evaluating the defensive abilities of MLB players."
-- Hal Richman, Strat-O-Matic Game Company

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