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Blue Notes · Umpire Grade2026-09-13

LAD @ MIA

Home plate: Brock Ballou

“The robots earned their keep tonight.”

B+
Umpire Grade
93.7% accurate
1.2
Run Favor
runs, LAD
6
ABS Overturns
of 8 reviewed

What this shows — how Brock Ballou called the 159 pitches that were taken (no swing), graded against the tracked rulebook strike zone, or, on a pitch the ABS (Automated Ball-Strike System) reviewed on a challenge, against its ruling. 149 were right. Below, only the misses are plotted, alongside every challenged pitch.

The zone, as he called it

Challenge 1: Max Muncy — the ump called it a strike, the robot ruled ball (OVERTURNED — ump overruled). Our tracking puts it on the other side of the line; the grade follows the ruling.1*Challenge 2: Joe Mack — the ump called it a ball, the robot ruled strike (OVERTURNED — ump overruled).2Challenge 3: Joe Mack — the ump called it a ball, the robot ruled strike (OVERTURNED — ump overruled).3Challenge 4: Joe Mack — the ump called it a ball, the robot ruled strike (OVERTURNED — ump overruled).4Challenge 5: Will Smith — the ump called it a ball, the robot ruled ball (upheld — ump confirmed).5Challenge 6: Otto Lopez — the ump called it a strike, the robot ruled ball (OVERTURNED — ump overruled).6Challenge 7: Joe Mack — the ump called it a ball, the robot ruled strike (OVERTURNED — ump overruled).7Challenge 8: Kyle Tucker — the ump called it a strike, the robot ruled strike (upheld — ump confirmed).8
strike called ballball called strikeABS overturnedABS upheld

* Graded on the ABS ruling. ABS measures its own zone, set by the batter’s height and taken at the middle of the plate, and our tracking puts this pitch on the other side of the line.

The calls that moved the game

  1. 1+0.69▲3 · 3-2 strike called ball· challenged ✓
    Max Muncy vs Eury Pérez
  2. 2-0.39▲3 · 2-2 ball called strike· challenged ✓
    Max Muncy vs Eury Pérez
  3. 3+0.39▲5 · 2-2 strike called ball
    Mookie Betts vs Eury Pérez

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

8 pitches went to the robots · 6 overturned (ump overruled) · 2 upheld (ump confirmed). This is the ABS system’s own measurement — Hawk-Eye optical ball-tracking, not our model.

  1. 1Max Muncy — ump said strike, robot ruled ball: overturned.
  2. 2Joe Mack — ump said ball, robot ruled strike: overturned.
  3. 3Joe Mack — ump said ball, robot ruled strike: overturned.
  4. 4Joe Mack — ump said ball, robot ruled strike: overturned.
  5. 5Will Smith — ump said ball, robot ruled ball: upheld.
  6. 6Otto Lopez — ump said strike, robot ruled ball: overturned.
  7. 7Joe Mack — ump said ball, robot ruled strike: overturned.
  8. 8Kyle Tucker — ump said strike, robot ruled strike: upheld.

Our tracked-rulebook zone matched the ABS ruling on 7 of 8 — a zone-definition gap (ABS grades a standardized, height-based zone). Where the two disagree, the umpire is graded on the ABS ruling.

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