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- Defensive Runs Saved (DRS) – This a statistic that estimates a player’s overall defensive value in terms of runs by aggregating a lot of smaller stats (more can be read about it here on Fangraphs). Essentially, it attempts to measure how many more or less plays a fielder makes compared to an average player at their position. Fangraphs says a player with +15 defensive runs saved is Gold-Glove caliber. Andrelton Simmons of the Angels led the league with 32 defensive runs saved last season.
- Ultimate Zone Rating (UZR) – Like DRS, UZR measures how many runs a player saves defensively. It also aggregates several different components to find its value. UZR/150 simply averages out UZR to the normal numbers of chances in one season. For comparison, Simmons had a 17.5 UZR and 18.5 UZR/150 last year.
- Revised Zone Rating (RZR) – This stat measures how often a player converts a ball hit into their area of the field into an out. For example, Freddy Galvis had 320 balls hit in his zone last year, and he converted 248 of them into outs, so he had a .775 RZR.