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Blue Notes · Umpire Grade2026-07-28

BOS @ ATH

Home plate: Mark Wegner

“ABS had a long evening on this one.”

B
Umpire Grade
92.5% accurate
0.2
Run Favor
runs, ATH
6
ABS Overturns
of 9 reviewed

What this shows — how Mark Wegner called the 134 pitches that were taken (no swing), graded against the tracked rulebook strike zone. He got 124 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: Carlos Narváez — the ump called it a ball, the robot ruled strike (OVERTURNED — ump overruled).1Challenge 2: Carlos Narváez — the ump called it a ball, the robot ruled strike (OVERTURNED — ump overruled).2Challenge 3: Carlos Narváez — the ump called it a ball, the robot ruled strike (OVERTURNED — ump overruled).3Challenge 4: Henry Bolte — the ump called it a strike, the robot ruled ball (OVERTURNED — ump overruled).4Challenge 5: Brian Serven — the ump called it a ball, the robot ruled strike (OVERTURNED — ump overruled).5Challenge 6: Brian Serven — the ump called it a ball, the robot ruled ball (upheld — ump confirmed).6Challenge 7: Hogan Harris — the ump called it a ball, the robot ruled strike (OVERTURNED — ump overruled).7Challenge 8: Andruw Monasterio — the ump called it a strike, the robot ruled strike (upheld — ump confirmed).8Challenge 9: Hogan Harris — the ump called it a ball, the robot ruled ball (upheld — ump confirmed).9
strike called ballball called strikeABS overturnedABS upheld

The calls that moved the game

  1. 1+0.39▼6 · 2-2 strike called ball· challenged ✓
    Nick Kurtz vs Jake Bennett
  2. 2+0.30▲2 · 3-1 strike called ball
    Andruw Monasterio vs Gage Jump
  3. 3+0.30▲8 · 3-1 strike called ball· challenged ✓
    Wilyer Abreu vs Hogan Harris

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 · 6 overturned (ump overruled) · 3 upheld (ump confirmed). This is the ABS system’s own measurement — Hawk-Eye optical ball-tracking, not our model.

  1. 1Carlos Narváez — ump said ball, robot ruled strike: overturned.
  2. 2Carlos Narváez — ump said ball, robot ruled strike: overturned.
  3. 3Carlos Narváez — ump said ball, robot ruled strike: overturned.
  4. 4Henry Bolte — ump said strike, robot ruled ball: overturned.
  5. 5Brian Serven — ump said ball, robot ruled strike: overturned.
  6. 6Brian Serven — ump said ball, robot ruled ball: upheld.
  7. 7Hogan Harris — ump said ball, robot ruled strike: overturned.
  8. 8Andruw Monasterio — ump said strike, robot ruled strike: upheld.
  9. 9Hogan Harris — ump said ball, robot ruled ball: upheld.

Our tracked-rulebook zone matched the ABS ruling on 7 of 9 — a zone-definition gap (ABS grades a standardized, height-based zone), not our error.

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