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Blue Notes · Umpire Grade2026-08-28

AZ @ SF

Home plate: Alan Porter

“A few too many trips to the challenge cart.”

B
Umpire Grade
92.5% accurate
0.5
Run Favor
runs, AZ
9
ABS Overturns
of 13 reviewed

What this shows — how Alan Porter called the 186 pitches that were taken (no swing), graded against the tracked rulebook strike zone. He got 172 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: Andrew Knizner — the ump called it a strike, the robot ruled ball (OVERTURNED — ump overruled).1Challenge 2: Andrew Knizner — the ump called it a strike, the robot ruled ball (OVERTURNED — ump overruled).2Challenge 3: Andrew Knizner — the ump called it a strike, the robot ruled ball (OVERTURNED — ump overruled).3Challenge 4: James McCann — the ump called it a strike, the robot ruled ball (OVERTURNED — ump overruled).4Challenge 5: James McCann — the ump called it a strike, the robot ruled ball (OVERTURNED — ump overruled).5Challenge 6: Andrew Knizner — the ump called it a strike, the robot ruled ball (OVERTURNED — ump overruled).6Challenge 7: James McCann — the ump called it a ball, the robot ruled ball (upheld — ump confirmed).7Challenge 8: James McCann — the ump called it a strike, the robot ruled ball (OVERTURNED — ump overruled).8Challenge 9: Drew Cavanaugh — the ump called it a ball, the robot ruled strike (OVERTURNED — ump overruled).9Challenge 10: Drew Cavanaugh — the ump called it a ball, the robot ruled ball (upheld — ump confirmed).10Challenge 11: Nolan Arenado — the ump called it a ball, the robot ruled strike (OVERTURNED — ump overruled).11Challenge 12: Tim Tawa — the ump called it a strike, the robot ruled strike (upheld — ump confirmed).12Challenge 13: Osleivis Basabe — the ump called it a strike, the robot ruled strike (upheld — ump confirmed).13
strike called ballball called strikeABS overturnedABS upheld

The calls that moved the game

  1. 1-0.39▼5 · 2-2 ball called strike
    Rafael Devers vs Gerardo Carrillo
  2. 2+0.28▲3 · 1-2 strike called ball
    Lars Nootbaar vs Blade Tidwell
  3. 3-0.28▼6 · 1-2 ball called strike
    Christian Koss vs Jonathan Loáisiga

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

13 pitches went to the robots · 9 overturned (ump overruled) · 4 upheld (ump confirmed). This is the ABS system’s own measurement — Hawk-Eye optical ball-tracking, not our model.

  1. 1Andrew Knizner — ump said strike, robot ruled ball: overturned.
  2. 2Andrew Knizner — ump said strike, robot ruled ball: overturned.
  3. 3Andrew Knizner — ump said strike, robot ruled ball: overturned.
  4. 4James McCann — ump said strike, robot ruled ball: overturned.
  5. 5James McCann — ump said strike, robot ruled ball: overturned.
  6. 6Andrew Knizner — ump said strike, robot ruled ball: overturned.
  7. 7James McCann — ump said ball, robot ruled ball: upheld.
  8. 8James McCann — ump said strike, robot ruled ball: overturned.
  9. 9Drew Cavanaugh — ump said ball, robot ruled strike: overturned.
  10. 10Drew Cavanaugh — ump said ball, robot ruled ball: upheld.
  11. 11Nolan Arenado — ump said ball, robot ruled strike: overturned.
  12. 12Tim Tawa — ump said strike, robot ruled strike: upheld.
  13. 13Osleivis Basabe — ump said strike, robot ruled strike: upheld.

Our tracked-rulebook zone matched the ABS ruling on 3 of 13 — a zone-definition gap (ABS grades a standardized, height-based zone), not our error.

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