Blue Notes · Umpire Grade2026-05-18
“One of those nights the numbers won't flatter.”
Umpire Grade
91.2% accurate
Run Favor
runs, BOS
ABS Overturns
of 4 reviewed
What this shows — how Laz Diaz called the 137 pitches that were taken (no swing), graded against the tracked rulebook strike zone. He got 125 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
- 1-0.28▼6 · 1-2 ball called strike
Bobby Witt Jr. vs Sonny Gray - 2+0.28▼7 · 1-2 strike called ball
Isaac Collins vs Justin Slaten - 3+0.10▲2 · 0-1 strike called ball
Masataka Yoshida vs Seth Lugo
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
4 pitches went to the robots · 2 overturned (ump overruled) · 2 upheld (ump confirmed). This is the ABS system’s own measurement — Hawk-Eye optical ball-tracking, not our model.
- 1Salvador Perez — ump said ball, robot ruled strike: overturned.
- 2Salvador Perez — ump said ball, robot ruled strike: overturned.
- 3Sonny Gray — ump said ball, robot ruled ball: upheld.
- 4Starling Marte — ump said strike, robot ruled strike: upheld.
Our tracked-rulebook zone matched the ABS ruling on 3 of 4 — a zone-definition gap (ABS grades a standardized, height-based zone), not our error.