Blue Notes · Umpire Grade2026-05-27
SEA @ ATH
Home plate: Mark Wegner
“Solid and unspectacular — exactly what the job asks.”
Umpire Grade
93.2% accurate
Run Favor
runs, SEA
ABS Overturns
of 3 reviewed
What this shows — how Mark Wegner called the 147 pitches that were taken (no swing), graded against the tracked rulebook strike zone. He got 137 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+0.69▲4 · 3-2 strike called ball
Jhonny Pereda vs Jeffrey Springs - 2-0.30▲1 · 3-1 ball called strike
Rob Refsnyder vs Jeffrey Springs - 3+0.13▼3 · 1-1 strike called ball
Darell Hernaiz vs Logan Gilbert
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.
- 1Jhonny Pereda — ump said ball, robot ruled ball: upheld.
- 2Jonah Heim — ump said strike, robot ruled ball: overturned.
- 3Jhonny Pereda — ump said ball, robot ruled ball: upheld.
Our tracked-rulebook zone matched the ABS ruling on 2 of 3 — a zone-definition gap (ABS grades a standardized, height-based zone), not our error.