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Blue Notes · Umpire Grade2026-09-16

BOS @ TEX

Home plate: Nick Mahrley

“The challenge cart got its steps in.”

C
Umpire Grade
89.1% accurate
0.5
Run Favor
runs, TEX
8
ABS Overturns
of 8 reviewed

What this shows — how Nick Mahrley called the 138 pitches that were taken (no swing), graded against the tracked rulebook strike zone. He got 123 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: Willson Contreras — the ump called it a strike, the robot ruled ball (OVERTURNED — ump overruled).1Challenge 2: Adley Rutschman — the ump called it a ball, the robot ruled strike (OVERTURNED — ump overruled).2Challenge 3: Caleb Durbin — the ump called it a strike, the robot ruled ball (OVERTURNED — ump overruled).3Challenge 4: Adley Rutschman — the ump called it a ball, the robot ruled strike (OVERTURNED — ump overruled).4Challenge 5: Nick Sogard — the ump called it a strike, the robot ruled ball (OVERTURNED — ump overruled).5Challenge 6: Danny Jansen — the ump called it a ball, the robot ruled strike (OVERTURNED — ump overruled).6Challenge 7: Adley Rutschman — the ump called it a ball, the robot ruled strike (OVERTURNED — ump overruled).7Challenge 8: Elias Díaz — the ump called it a strike, the robot ruled ball (OVERTURNED — ump overruled).8
strike called ballball called strikeABS overturnedABS upheld

The calls that moved the game

  1. 1+0.39▼7 · 2-2 strike called ball· challenged ✓
    Wyatt Langford vs Erik Miller
  2. 2+0.30▼3 · 3-1 strike called ball· challenged ✓
    Jake Burger vs Jake Bennett
  3. 3+0.28▼5 · 1-2 strike called ball· challenged ✓
    Jake Burger vs Jake Bennett

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

8 pitches went to the robots · 8 overturned (ump overruled) · 0 upheld (ump confirmed). This is the ABS system’s own measurement — Hawk-Eye optical ball-tracking, not our model.

  1. 1Willson Contreras — ump said strike, robot ruled ball: overturned.
  2. 2Adley Rutschman — ump said ball, robot ruled strike: overturned.
  3. 3Caleb Durbin — ump said strike, robot ruled ball: overturned.
  4. 4Adley Rutschman — ump said ball, robot ruled strike: overturned.
  5. 5Nick Sogard — ump said strike, robot ruled ball: overturned.
  6. 6Danny Jansen — ump said ball, robot ruled strike: overturned.
  7. 7Adley Rutschman — ump said ball, robot ruled strike: overturned.
  8. 8Elias Díaz — ump said strike, robot ruled ball: overturned.

Our tracked-rulebook zone matched the ABS ruling on 6 of 8 — a zone-definition gap (ABS grades a standardized, height-based zone), not our error.

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