Blue Notes · Umpire Grade2026-06-07
CWS @ PHI
Home plate: Alex MacKay
“A steady night's work behind the plate.”
Umpire Grade
97.9% accurate
Run Favor
runs, PHI
ABS Overturns
of 4 reviewed
What this shows — how Alex MacKay called the 186 pitches that were taken (no swing), graded against the tracked rulebook strike zone. He got 182 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
- 1-0.21▲2 · 3-0 ball called strike
Miguel Vargas vs Aaron Nola - 2+0.13▼1 · 1-1 strike called ball
Alec Bohm vs David Sandlin - 3-0.09▲2 · 0-0 ball called strike
Andrew Benintendi vs Aaron Nola
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
4 pitches went to the robots · 2 overturned (ump overruled) · 2 upheld (ump confirmed). This is Hawkeye ground truth, no model involved.
- 1Rafael Marchán — ump said strike, robot ruled ball: overturned.
- 2Rafael Marchán — ump said ball, robot ruled ball: upheld.
- 3Colson Montgomery — ump said ball, robot ruled strike: overturned.
- 4Drew Romo — ump said ball, robot ruled ball: upheld.
Our tracked-rulebook zone matched the ABS ruling on 2 of 4 — a zone-definition gap (ABS grades a standardized, height-based zone), not our error.