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Blue Notes · Umpire Grade2026-04-26

SEA @ STL

Home plate: John Bacon

“The challenge cart got its steps in.”

C+
Umpire Grade
90.3% accurate
0.2
Run Favor
runs, SEA
8
ABS Overturns
of 9 reviewed

What this shows — how John Bacon called the 155 pitches that were taken (no swing), graded against the tracked rulebook strike zone. He got 140 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: Iván Herrera — the ump called it a ball, the robot ruled strike (OVERTURNED — ump overruled).1Challenge 2: Iván Herrera — the ump called it a ball, the robot ruled strike (OVERTURNED — ump overruled).2Challenge 3: Julio Rodríguez — the ump called it a strike, the robot ruled ball (OVERTURNED — ump overruled).3Challenge 4: Dominic Canzone — the ump called it a strike, the robot ruled ball (OVERTURNED — ump overruled).4Challenge 5: Iván Herrera — the ump called it a ball, the robot ruled strike (OVERTURNED — ump overruled).5Challenge 6: J.P. Crawford — the ump called it a strike, the robot ruled ball (OVERTURNED — ump overruled).6Challenge 7: Iván Herrera — the ump called it a ball, the robot ruled strike (OVERTURNED — ump overruled).7Challenge 8: Rob Refsnyder — the ump called it a strike, the robot ruled ball (OVERTURNED — ump overruled).8Challenge 9: JJ Wetherholt — the ump called it a strike, the robot ruled strike (upheld — ump confirmed).9
strike called ballball called strikeABS overturnedABS upheld

The calls that moved the game

  1. 1+0.69▲8 · 3-2 strike called ball· challenged ✓
    J.P. Crawford vs Ryne Stanek
  2. 2-0.39▲5 · 2-2 ball called strike· challenged ✓
    Dominic Canzone vs Michael McGreevy
  3. 3-0.23▲9 · 0-2 ball called strike· challenged ✓
    Rob Refsnyder vs JoJo Romero

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

9 pitches went to the robots · 8 overturned (ump overruled) · 1 upheld (ump confirmed). This is the ABS system’s own measurement — Hawk-Eye optical ball-tracking, not our model.

  1. 1Iván Herrera — ump said ball, robot ruled strike: overturned.
  2. 2Iván Herrera — ump said ball, robot ruled strike: overturned.
  3. 3Julio Rodríguez — ump said strike, robot ruled ball: overturned.
  4. 4Dominic Canzone — ump said strike, robot ruled ball: overturned.
  5. 5Iván Herrera — ump said ball, robot ruled strike: overturned.
  6. 6J.P. Crawford — ump said strike, robot ruled ball: overturned.
  7. 7Iván Herrera — ump said ball, robot ruled strike: overturned.
  8. 8Rob Refsnyder — ump said strike, robot ruled ball: overturned.
  9. 9JJ Wetherholt — ump said strike, robot ruled strike: upheld.

Our tracked-rulebook zone matched the ABS ruling on 8 of 9 — a zone-definition gap (ABS grades a standardized, height-based zone), not our error.

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