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Blue Notes · Umpire Grade2026-04-18

CWS @ ATH

Home plate: Chad Whitson

“Somebody's pitching staff sent a thank-you note.”

B-
Umpire Grade
91.6% accurate
1.8
Run Favor
runs, CWS
3
ABS Overturns
of 7 reviewed

What this shows — how Chad Whitson called the 191 pitches that were taken (no swing), graded against the tracked rulebook strike zone. He got 175 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: Austin Wynns — the ump called it a ball, the robot ruled ball (upheld — ump confirmed).1Challenge 2: Austin Wynns — the ump called it a ball, the robot ruled ball (upheld — ump confirmed).2Challenge 3: Reese McGuire — the ump called it a ball, the robot ruled ball (upheld — ump confirmed).3Challenge 4: Munetaka Murakami — the ump called it a strike, the robot ruled ball (OVERTURNED — ump overruled).4Challenge 5: Munetaka Murakami — the ump called it a strike, the robot ruled ball (OVERTURNED — ump overruled).5Challenge 6: Chase Meidroth — the ump called it a strike, the robot ruled strike (upheld — ump confirmed).6Challenge 7: Austin Wynns — the ump called it a ball, the robot ruled strike (OVERTURNED — ump overruled).7
strike called ballball called strikeABS overturnedABS upheld

The calls that moved the game

  1. 1+0.69▲10 · 3-2 strike called ball· challenged ✓
    Chase Meidroth vs Jack Perkins
  2. 2+0.28▲3 · 1-2 strike called ball
    Miguel Vargas vs Luis Severino
  3. 3+0.28▲11 · 1-2 strike called ball
    Luisangel Acuña vs Jack Perkins

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. 1Austin Wynns — ump said ball, robot ruled ball: upheld.
  2. 2Austin Wynns — ump said ball, robot ruled ball: upheld.
  3. 3Reese McGuire — ump said ball, robot ruled ball: upheld.
  4. 4Munetaka Murakami — ump said strike, robot ruled ball: overturned.
  5. 5Munetaka Murakami — ump said strike, robot ruled ball: overturned.
  6. 6Chase Meidroth — ump said strike, robot ruled strike: upheld.
  7. 7Austin Wynns — ump said ball, robot ruled strike: overturned.

Our tracked-rulebook zone matched the ABS ruling on 6 of 7 — a zone-definition gap (ABS grades a standardized, height-based zone), not our error.

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