Blue Notes · Umpire Grade2026-05-01
AZ @ CHC
Home plate: Mike Muchlinski
“Borderline went to the battery all night.”
Umpire Grade
93.6% accurate
Run Favor
runs, AZ
ABS Overturns
of 3 reviewed
What this shows — how Mike Muchlinski called the 171 pitches that were taken (no swing), graded against the tracked rulebook strike zone. He got 160 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
- 1-0.30▼3 · 3-1 ball called strike· challenged
Ian Happ vs Zac Gallen - 2-0.28▼6 · 1-2 ball called strike
Moisés Ballesteros vs Brandyn Garcia - 3-0.21▼1 · 3-0 ball called strike
Ian Happ vs Zac Gallen
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
3 pitches went to the robots · 1 overturned (ump overruled) · 2 upheld (ump confirmed). This is Hawkeye ground truth, no model involved.
- 1Ian Happ — ump said strike, robot ruled strike: upheld.
- 2Gabriel Moreno — ump said strike, robot ruled ball: overturned.
- 3Ketel Marte — ump said strike, robot ruled strike: upheld.
Our tracked-rulebook zone matched the ABS ruling on 1 of 3 — a zone-definition gap (ABS grades a standardized, height-based zone), not our error.