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Blue Notes · Umpire Grade2026-05-31

ATL @ CIN

Home plate: Nick Mahrley

“The zone stretched its legs.”

C+
Umpire Grade
90.5% accurate
0.7
Run Favor
runs, ATL
2
ABS Overturns
of 5 reviewed

What this shows — how Nick Mahrley called the 157 pitches that were taken (no swing), graded against the tracked rulebook strike zone. He got 142 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: Sal Stewart — the ump called it a strike, the robot ruled ball (OVERTURNED — ump overruled).1Challenge 2: JJ Bleday — the ump called it a strike, the robot ruled strike (upheld — ump confirmed).2Challenge 3: Will Benson — the ump called it a strike, the robot ruled ball (OVERTURNED — ump overruled).3Challenge 4: Michael Harris II — the ump called it a strike, the robot ruled strike (upheld — ump confirmed).4Challenge 5: P.J. Higgins — the ump called it a ball, the robot ruled ball (upheld — ump confirmed).5
strike called ballball called strikeABS overturnedABS upheld

The calls that moved the game

  1. 1-0.39▼6 · 2-2 ball called strike· challenged ✓
    Will Benson vs Didier Fuentes
  2. 2+0.23▼7 · 0-2 strike called ball
    Nathaniel Lowe vs Dylan Dodd
  3. 3-0.20▲7 · 2-1 ball called strike
    Ha-Seong Kim vs Nick Lodolo

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

5 pitches went to the robots · 2 overturned (ump overruled) · 3 upheld (ump confirmed). This is the ABS system’s own measurement — Hawk-Eye optical ball-tracking, not our model.

  1. 1Sal Stewart — ump said strike, robot ruled ball: overturned.
  2. 2JJ Bleday — ump said strike, robot ruled strike: upheld.
  3. 3Will Benson — ump said strike, robot ruled ball: overturned.
  4. 4Michael Harris II — ump said strike, robot ruled strike: upheld.
  5. 5P.J. Higgins — ump said ball, robot ruled ball: upheld.

Our tracked-rulebook zone matched the ABS ruling on 5 of 5 — a zone-definition gap (ABS grades a standardized, height-based zone), not our error.

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