Blue Notes · Umpire Grade2026-07-01
SF @ AZ
Home plate: Nick Mahrley
“An honest evening's grade: nothing loud, nothing missed by much.”
Umpire Grade
95.0% accurate
Run Favor
runs, SF
ABS Overturns
of 1 reviewed
What this shows — how Nick Mahrley called the 160 pitches that were taken (no swing), graded against the tracked rulebook strike zone. He got 152 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
strike called ballball called strikeABS overturnedABS upheld
The calls that moved the game
- 1-0.13▼2 · 1-0 ball called strike
Adrian Del Castillo vs Trevor McDonald - 2-0.13▼7 · 1-0 ball called strike
Gabriel Moreno vs Erik Miller - 3+0.10▲6 · 0-1 strike called ball
Victor Bericoto vs Ryan Thompson
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
1 pitch went to the robots · 0 overturned (ump overruled) · 1 upheld (ump confirmed). This is Hawkeye ground truth, no model involved.
- 1Drew Cavanaugh — ump said strike, robot ruled strike: upheld.
Our tracked-rulebook zone matched the ABS ruling on 1 of 1 — a zone-definition gap (ABS grades a standardized, height-based zone), not our error.