Blue Notes · Umpire Grade2026-05-18
MIL @ CHC
Home plate: Derek Thomas
“Called it the way the rulebook drew it up.”
Umpire Grade
96.5% accurate
Run Favor
runs, MIL
ABS Overturns
of 3 reviewed
What this shows — how Derek Thomas called the 141 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+0.30▲5 · 3-1 strike called ball
Christian Yelich vs Shota Imanaga - 2+0.28▲3 · 1-2 strike called ball· challenged
Jackson Chourio vs Shota Imanaga - 3-0.13▲5 · 1-1 ball called strike
Sal Frelick vs Ethan Roberts
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.
- 1Carson Kelly — ump said ball, robot ruled ball: upheld.
- 2William Contreras — ump said strike, robot ruled ball: overturned.
- 3Carson Kelly — ump said strike, robot ruled ball: overturned.
Our tracked-rulebook zone matched the ABS ruling on 0 of 3 — a zone-definition gap (ABS grades a standardized, height-based zone), not our error.