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Umpire Leaderboard
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| UmpireHome plate umpire name | GGames worked behind home plate this season | PitchesTotal called pitches (called strikes + balls). Does not include swings or HBP. | Acc%Accuracy: % of called pitches where the umpire made the correct call based on the true strike zone | CS%Called Strike Rate: % of all called pitches that were called strikes (correct or not) | OOZ K%Out-of-Zone Strike %: % of pitches outside the true zone that were incorrectly called strikes. Higher = bigger zone. | IZ Ball%In-Zone Ball %: % of pitches inside the true zone that were incorrectly called balls. Higher = tighter zone. | ZoneZone Size Factor: Umpire's OOZ strike rate relative to league average. >1.00 = bigger zone, <1.00 = tighter zone. | FavorFavor Index: OOZ K% minus IZ Ball%. Positive = more bad strikes than bad balls (pitcher-friendly errors). Negative = more bad balls than bad strikes (hitter-friendly errors). | ABSABS Challenges: Total Automated Ball-Strike challenge requests against this umpire | OT%ABS Overturn %: % of ABS challenges that resulted in the call being overturned | Shad HiShadow High %: Called strike rate on pitches just above the top of the zone (within ~5 inches). Higher = expands zone upward. | Shad LoShadow Low %: Called strike rate on pitches just below the bottom of the zone (within ~5 inches). Higher = expands zone downward. | Run EnvRun Environment Factor: Average total runs in this umpire's games vs league average. >1.00 = higher-scoring games, <1.00 = lower-scoring. |
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Glossary
G
Games worked behind home plate this season.
Pitches
Total called pitches (called strikes + balls). Does not include swings, foul balls, or hit-by-pitches.
Acc%
Accuracy — the percentage of called pitches where the umpire made the correct call based on the true strike zone boundaries.
CS%
Called Strike Rate — the percentage of all called pitches that were ruled strikes, whether correct or not. Higher values indicate an umpire who calls more strikes overall.
OOZ K%
Out-of-Zone Strike % — the percentage of pitches outside the true strike zone that were incorrectly called strikes. A higher rate means the umpire tends to expand the zone (helps pitchers).
IZ Ball%
In-Zone Ball % — the percentage of pitches inside the true strike zone that were incorrectly called balls. A higher rate means the umpire tends to contract the zone (helps hitters).
Zone Size
Zone Size Factor — the umpire's out-of-zone strike rate divided by the league average. A value above 1.00 means a bigger-than-average zone; below 1.00 means a tighter zone.
Favor
Favor Index — calculated as OOZ K% minus IZ Ball%. A positive value means the umpire makes more incorrect strikes than incorrect balls (pitcher-friendly errors). A negative value means more incorrect balls (hitter-friendly errors). Note: this measures error balance, not zone size — an umpire can have a tight zone overall but still lean pitcher-friendly if their few mistakes skew toward bad strikes.
ABS
ABS Challenges — the total number of Automated Ball-Strike system challenge requests made against this umpire's calls during the season.
OT%
ABS Overturn % — the percentage of ABS challenges that resulted in the umpire's original call being overturned. A higher rate suggests more reviewable incorrect calls.
Shad Hi
Shadow High % — the called strike rate on pitches located just above the top of the strike zone (within ~5 inches). Higher values mean the umpire tends to expand their zone upward.
Shad Lo
Shadow Low % — the called strike rate on pitches located just below the bottom of the strike zone (within ~5 inches). Higher values mean the umpire tends to expand their zone downward.
Run Env
Run Environment Factor — the average total runs scored in this umpire's games divided by the league average. Values above 1.00 indicate higher-scoring games; below 1.00 indicates lower-scoring games.