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Blue Notes · Umpire Grade2026-07-18

BAL @ HOU

Home plate: Brian O'Nora

“ABS had a long evening on this one.”

B
Umpire Grade
92.3% accurate
0.1
Run Favor
runs, HOU
5
ABS Overturns
of 7 reviewed

What this shows — how Brian O'Nora called the 183 pitches that were taken (no swing), graded against the tracked rulebook strike zone. He got 169 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: Yainer Diaz — the ump called it a ball, the robot ruled strike (OVERTURNED — ump overruled).1Challenge 2: Samuel Basallo — the ump called it a ball, the robot ruled strike (OVERTURNED — ump overruled).2Challenge 3: Yainer Diaz — the ump called it a ball, the robot ruled strike (OVERTURNED — ump overruled).3Challenge 4: Yainer Diaz — the ump called it a ball, the robot ruled strike (OVERTURNED — ump overruled).4Challenge 5: Jose Altuve — the ump called it a strike, the robot ruled strike (upheld — ump confirmed).5Challenge 6: Samuel Basallo — the ump called it a strike, the robot ruled strike (upheld — ump confirmed).6Challenge 7: Tyler O'Neill — the ump called it a strike, the robot ruled ball (OVERTURNED — ump overruled).7
strike called ballball called strikeABS overturnedABS upheld

The calls that moved the game

  1. 1-0.28▲9 · 1-2 ball called strike· challenged ✓
    Tyler O'Neill vs Josh Hader
  2. 2+0.23▲5 · 0-2 strike called ball
    Gunnar Henderson vs Spencer Arrighetti
  3. 3+0.20▲8 · 2-1 strike called ball· challenged ✓
    Pete Alonso vs Bryan Abreu

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. 1Yainer Diaz — ump said ball, robot ruled strike: overturned.
  2. 2Samuel Basallo — ump said ball, robot ruled strike: overturned.
  3. 3Yainer Diaz — ump said ball, robot ruled strike: overturned.
  4. 4Yainer Diaz — ump said ball, robot ruled strike: overturned.
  5. 5Jose Altuve — ump said strike, robot ruled strike: upheld.
  6. 6Samuel Basallo — ump said strike, robot ruled strike: upheld.
  7. 7Tyler O'Neill — ump said strike, robot ruled ball: overturned.

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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