Blue Notes · Umpire Grade2026-04-06
MIL @ BOS
Home plate: Chris Conroy
“Down the middle. Both dugouts had the same zone.”
Umpire Grade
94.0% accurate
Run Favor
runs, MIL
ABS Overturns
of 1 reviewed
What this shows — how Chris Conroy called the 200 pitches that were taken (no swing), graded against the tracked rulebook strike zone. He got 188 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+0.39▲3 · 2-2 strike called ball
Christian Yelich vs Brayan Bello - 2+0.28▲8 · 1-2 strike called ball
William Contreras vs Garrett Whitlock - 3+0.20▲8 · 2-1 strike called ball
Christian Yelich vs Garrett Whitlock
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 · 0 overturned (ump overruled) · 1 upheld (ump confirmed). This is Hawkeye ground truth, no model involved.
- 1William Contreras — ump said ball, robot ruled ball: upheld.
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.