Blue Notes · Umpire Grade2026-05-18
SF @ AZ
Home plate: Chad Whitson
“You could set a watch by that zone.”
Umpire Grade
95.8% accurate
Run Favor
runs, SF
ABS Overturns
of 1 reviewed
What this shows — how Chad Whitson called the 142 pitches that were taken (no swing), graded against the tracked rulebook strike zone. He got 136 right. Below, only his misses are plotted, alongside every pitch the ABS (Automated Ball-Strike System) reviewed on a challenge.
The zone, as he called it
strike called ballball called strikeABS overturnedABS upheld
The calls that moved the game
- 1+0.20▲7 · 2-1 strike called ball
Matt Chapman vs Ryan Thompson - 2-0.13▲5 · 1-0 ball called strike
Will Brennan vs Zac Gallen - 3-0.13▼5 · 1-0 ball called strike
Corbin Carroll vs JT Brubaker
Run impact from the count run-value table: a missed strike three is worth far more than one on 3-0.
ABS — the Automated Ball-Strike System
1 pitch went to the robots · 1 overturned (ump overruled) · 0 upheld (ump confirmed). This is Hawkeye ground truth, no model involved.
- 1Gabriel Moreno — ump said strike, robot ruled ball: overturned.
Our tracked-rulebook zone matched the ABS ruling on 0 of 1 — a zone-definition gap (ABS grades a standardized, height-based zone), not our error.