Blue Notes · Umpire Grade2026-05-13
STL @ ATH
Home plate: Chad Whitson
“Down the middle. Both dugouts had the same zone.”
Umpire Grade
94.5% accurate
Run Favor
runs, STL
ABS Overturns
of 3 reviewed
What this shows — how Chad Whitson called the 145 pitches that were taken (no swing), graded against the tracked rulebook strike zone. He got 137 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
- 1-0.30▲1 · 3-1 ball called strike
Alec Burleson vs J.T. Ginn - 2+0.19▲1 · 2-0 strike called ball
Alec Burleson vs J.T. Ginn - 3-0.13▲3 · 1-0 ball called strike
Iván Herrera vs J.T. Ginn
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
3 pitches went to the robots · 2 overturned (ump overruled) · 1 upheld (ump confirmed). This is Hawkeye ground truth, no model involved.
- 1Jonah Heim — ump said strike, robot ruled ball: overturned.
- 2Pedro Pagés — ump said strike, robot ruled ball: overturned.
- 3José Fermín — ump said strike, robot ruled strike: upheld.
Our tracked-rulebook zone matched the ABS ruling on 1 of 3 — a zone-definition gap (ABS grades a standardized, height-based zone), not our error.