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Blue Notes · Umpire Grade2026-04-21

BAL @ KC

Home plate: Brock Ballou

“A steady night's work behind the plate.”

B+
Umpire Grade
93.2% accurate
0.1
Run Favor
runs, KC
4
ABS Overturns
of 6 reviewed

What this shows — how Brock Ballou called the 162 pitches that were taken (no swing), graded against the tracked rulebook strike zone. He got 151 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: Salvador Perez — the ump called it a ball, the robot ruled strike (OVERTURNED — ump overruled).1Challenge 2: Taylor Ward — the ump called it a strike, the robot ruled ball (OVERTURNED — ump overruled).2Challenge 3: Salvador Perez — the ump called it a ball, the robot ruled strike (OVERTURNED — ump overruled).3Challenge 4: Weston Wilson — the ump called it a strike, the robot ruled strike (upheld — ump confirmed).4Challenge 5: Salvador Perez — the ump called it a ball, the robot ruled strike (OVERTURNED — ump overruled).5Challenge 6: Adley Rutschman — the ump called it a ball, the robot ruled ball (upheld — ump confirmed).6
strike called ballball called strikeABS overturnedABS upheld

The calls that moved the game

  1. 1+0.28▼7 · 1-2 strike called ball
    Kyle Isbel vs Shane Baz
  2. 2-0.20▲5 · 2-1 ball called strike
    Blaze Alexander vs Kris Bubic
  3. 3-0.20▼7 · 2-1 ball called strike
    Maikel Garcia vs Shane Baz

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

6 pitches went to the robots · 4 overturned (ump overruled) · 2 upheld (ump confirmed). This is the ABS system’s own measurement — Hawk-Eye optical ball-tracking, not our model.

  1. 1Salvador Perez — ump said ball, robot ruled strike: overturned.
  2. 2Taylor Ward — ump said strike, robot ruled ball: overturned.
  3. 3Salvador Perez — ump said ball, robot ruled strike: overturned.
  4. 4Weston Wilson — ump said strike, robot ruled strike: upheld.
  5. 5Salvador Perez — ump said ball, robot ruled strike: overturned.
  6. 6Adley Rutschman — ump said ball, robot ruled ball: upheld.

Our tracked-rulebook zone matched the ABS ruling on 6 of 6 — a zone-definition gap (ABS grades a standardized, height-based zone), not our error.

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