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Blue Notes · Umpire Grade2026-09-08

CHC @ MIL

Home plate: Adam Hamari

“Squeezed the edges; the hitters didn't mind at all.”

C
Umpire Grade
89.6% accurate
0.7
Run Favor
runs, MIL
3
ABS Overturns
of 7 reviewed

What this shows — how Adam Hamari called the 164 pitches that were taken (no swing), graded against the tracked rulebook strike zone. He got 147 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

Challenge 1: William Contreras — the ump called it a ball, the robot ruled strike (OVERTURNED — ump overruled).1Challenge 2: Ian Happ — the ump called it a strike, the robot ruled ball (OVERTURNED — ump overruled).2Challenge 3: William Contreras — the ump called it a ball, the robot ruled ball (upheld — ump confirmed).3Challenge 4: Miguel Amaya — the ump called it a ball, the robot ruled strike (OVERTURNED — ump overruled).4Challenge 5: Luis Lara — the ump called it a strike, the robot ruled strike (upheld — ump confirmed).5Challenge 6: Matt Shaw — the ump called it a strike, the robot ruled strike (upheld — ump confirmed).6Challenge 7: William Contreras — the ump called it a ball, the robot ruled ball (upheld — ump confirmed).7
strike called ballball called strikeABS overturnedABS upheld

The calls that moved the game

  1. 1+0.39▼4 · 2-2 strike called ball· challenged ✓
    William Contreras vs David Peterson
  2. 2+0.30▼5 · 3-1 strike called ball
    Brice Turang vs David Peterson
  3. 3+0.28▲9 · 1-2 strike called ball
    Carson Kelly vs Trevor Megill

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

7 pitches went to the robots · 3 overturned (ump overruled) · 4 upheld (ump confirmed). This is the ABS system’s own measurement — Hawk-Eye optical ball-tracking, not our model.

  1. 1William Contreras — ump said ball, robot ruled strike: overturned.
  2. 2Ian Happ — ump said strike, robot ruled ball: overturned.
  3. 3William Contreras — ump said ball, robot ruled ball: upheld.
  4. 4Miguel Amaya — ump said ball, robot ruled strike: overturned.
  5. 5Luis Lara — ump said strike, robot ruled strike: upheld.
  6. 6Matt Shaw — ump said strike, robot ruled strike: upheld.
  7. 7William Contreras — ump said ball, robot ruled ball: upheld.

Our tracked-rulebook zone matched the ABS ruling on 7 of 7 — a zone-definition gap (ABS grades a standardized, height-based zone), not our error.

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