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Blue Notes · Umpire Grade2026-09-20

MIL @ BAL

Home plate: Alan Porter

“The kind of night where the umpire is the least of the story.”

A-
Umpire Grade
94.6% accurate
0.2
Run Favor
runs, BAL
4
ABS Overturns
of 4 reviewed

What this shows — how Alan Porter called the 149 pitches that were taken (no swing), graded against the tracked rulebook strike zone. He got 141 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: Carlos Narváez — the ump called it a ball, the robot ruled strike (OVERTURNED — ump overruled).1Challenge 2: Coby Mayo — the ump called it a strike, the robot ruled ball (OVERTURNED — ump overruled).2Challenge 3: Samuel Basallo — the ump called it a strike, the robot ruled ball (OVERTURNED — ump overruled).3Challenge 4: Cooper Pratt — the ump called it a strike, the robot ruled ball (OVERTURNED — ump overruled).4
strike called ballball called strikeABS overturnedABS upheld

The calls that moved the game

  1. 1-0.69▲9 · 3-2 ball called strike· challenged ✓
    Cooper Pratt vs Cam Sanders
  2. 2-0.21▼6 · 3-0 ball called strike· challenged ✓
    Samuel Basallo vs Chad Patrick
  3. 3-0.19▼7 · 2-0 ball called strike
    Christian Encarnacion-Strand vs Kyle Harrison

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 · 4 overturned (ump overruled) · 0 upheld (ump confirmed). This is the ABS system’s own measurement — Hawk-Eye optical ball-tracking, not our model.

  1. 1Carlos Narváez — ump said ball, robot ruled strike: overturned.
  2. 2Coby Mayo — ump said strike, robot ruled ball: overturned.
  3. 3Samuel Basallo — ump said strike, robot ruled ball: overturned.
  4. 4Cooper Pratt — ump said strike, robot ruled ball: overturned.

Our tracked-rulebook zone matched the ABS ruling on 2 of 4 — a zone-definition gap (ABS grades a standardized, height-based zone), not our error.

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