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Blue Notes · Umpire Grade2026-08-03

TB @ COL

Home plate: Alex MacKay

“The zone kept its promises.”

A
Umpire Grade
95.6% accurate
0.5
Run Favor
runs, TB
1
ABS Overturns
of 4 reviewed

What this shows — how Alex MacKay called the 114 pitches that were taken (no swing), graded against the tracked rulebook strike zone. He got 109 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: Hunter Goodman — the ump called it a ball, the robot ruled strike (OVERTURNED — ump overruled).1Challenge 2: Kyle Karros — the ump called it a strike, the robot ruled strike (upheld — ump confirmed).2Challenge 3: Willi Castro — the ump called it a strike, the robot ruled strike (upheld — ump confirmed).3Challenge 4: Chandler Simpson — the ump called it a strike, the robot ruled strike (upheld — ump confirmed).4
strike called ballball called strikeABS overturnedABS upheld

The calls that moved the game

  1. 1+0.23▲6 · 0-2 strike called ball· challenged ✓
    Yandy Díaz vs Tanner Gordon
  2. 2+0.13▲5 · 1-0 strike called ball
    Victor Mesa Jr. vs Tanner Gordon
  3. 3-0.09▲1 · 0-0 ball called strike
    Yandy Díaz vs Michael Lorenzen

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

  1. 1Hunter Goodman — ump said ball, robot ruled strike: overturned.
  2. 2Kyle Karros — ump said strike, robot ruled strike: upheld.
  3. 3Willi Castro — ump said strike, robot ruled strike: upheld.
  4. 4Chandler Simpson — ump said strike, robot ruled strike: upheld.

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

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