Blue Notes · Umpire Grade2026-04-21
“Reliable as a Tuesday: no complaints, no headlines.”
Umpire Grade
92.5% accurate
Run Favor
runs, ATL
ABS Overturns
of 5 reviewed
What this shows — how Laz Diaz called the 199 pitches that were taken (no swing), graded against the tracked rulebook strike zone. He got 184 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+0.69▼1 · 3-2 strike called ball
James Wood vs Reynaldo López - 2-0.30▼7 · 3-1 ball called strike
Drew Millas vs Ian Hamilton - 3+0.19▲8 · 2-0 strike called ball
Mauricio Dubón vs Cionel Pérez
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
5 pitches went to the robots · 2 overturned (ump overruled) · 3 upheld (ump confirmed). This is the ABS system’s own measurement — Hawk-Eye optical ball-tracking, not our model.
- 1Drew Millas — ump said ball, robot ruled ball: upheld.
- 2Ronald Acuña Jr. — ump said strike, robot ruled strike: upheld.
- 3James Wood — ump said strike, robot ruled ball: overturned.
- 4Mauricio Dubón — ump said strike, robot ruled ball: overturned.
- 5Drew Millas — ump said ball, robot ruled ball: upheld.
Our tracked-rulebook zone matched the ABS ruling on 4 of 5 — a zone-definition gap (ABS grades a standardized, height-based zone), not our error.