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Blue Notes · Umpire Grade2026-04-05

STL @ DET

Home plate: Mark Wegner

“The Automated Ball-Strike System put in some overtime here.”

B-
Umpire Grade
91.1% accurate
0.8
Run Favor
runs, STL
5
ABS Overturns
of 7 reviewed

What this shows — how Mark Wegner called the 169 pitches that were taken (no swing), graded against the tracked rulebook strike zone. He got 154 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: Dillon Dingler — the ump called it a ball, the robot ruled strike (OVERTURNED — ump overruled).1Challenge 2: Pedro Pagés — the ump called it a ball, the robot ruled strike (OVERTURNED — ump overruled).2Challenge 3: Pedro Pagés — the ump called it a ball, the robot ruled ball (upheld — ump confirmed).3Challenge 4: Dillon Dingler — the ump called it a ball, the robot ruled strike (OVERTURNED — ump overruled).4Challenge 5: Dillon Dingler — the ump called it a ball, the robot ruled strike (OVERTURNED — ump overruled).5Challenge 6: Dillon Dingler — the ump called it a ball, the robot ruled strike (OVERTURNED — ump overruled).6Challenge 7: Kerry Carpenter — the ump called it a strike, the robot ruled strike (upheld — ump confirmed).7
strike called ballball called strikeABS overturnedABS upheld

The calls that moved the game

  1. 1+0.23▲4 · 0-2 strike called ball· challenged ✓
    Iván Herrera vs Keider Montero
  2. 2-0.21▼1 · 3-0 ball called strike
    Kerry Carpenter vs Kyle Leahy
  3. 3-0.21▲8 · 3-0 ball called strike
    Jordan Walker vs Connor Seabold

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

  1. 1Dillon Dingler — ump said ball, robot ruled strike: overturned.
  2. 2Pedro Pagés — ump said ball, robot ruled strike: overturned.
  3. 3Pedro Pagés — ump said ball, robot ruled ball: upheld.
  4. 4Dillon Dingler — ump said ball, robot ruled strike: overturned.
  5. 5Dillon Dingler — ump said ball, robot ruled strike: overturned.
  6. 6Dillon Dingler — ump said ball, robot ruled strike: overturned.
  7. 7Kerry Carpenter — ump said strike, robot ruled strike: upheld.

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

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