Blue Notes · Umpire Grade2026-04-12
CWS @ KC
Home plate: Nick Mahrley
“Called a fair game and let the players decide it.”
Umpire Grade
92.8% accurate
Run Favor
runs, KC
ABS Overturns
of 2 reviewed
What this shows — how Nick Mahrley called the 152 pitches that were taken (no swing), graded against the tracked rulebook strike zone. He got 141 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+0.39▼1 · 2-2 strike called ball
Maikel Garcia vs Grant Taylor - 2+0.19▲6 · 2-0 strike called ball
Munetaka Murakami vs Noah Cameron - 3+0.13▲6 · 1-1 strike called ball
Colson Montgomery vs Nick Mears
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
2 pitches went to the robots · 1 overturned (ump overruled) · 1 upheld (ump confirmed). This is Hawkeye ground truth, no model involved.
- 1Maikel Garcia — ump said ball, robot ruled strike: overturned.
- 2Edgar Quero — ump said ball, robot ruled ball: upheld.
Our tracked-rulebook zone matched the ABS ruling on 1 of 2 — a zone-definition gap (ABS grades a standardized, height-based zone), not our error.