Fever BaseballFor collectors and stat nerdsFuture Value Radar (FVR) · On the record
Blue Notes · Umpire Grade2026-05-27

SEA @ ATH

Home plate: Mark Wegner

Squeezed the edges; the hitters didn't mind at all.

B
Umpire Grade
92.5% accurate
0.4
Run Favor
runs, SEA
1
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 136 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

Challenge 1: Jhonny Pereda — the ump called it a ball, the robot ruled ball (upheld — ump confirmed).1Challenge 2: Jonah Heim — the ump called it a ball, the robot ruled strike (OVERTURNED — ump overruled).2Challenge 3: Jhonny Pereda — the ump called it a ball, the robot ruled ball (upheld — ump confirmed).3
strike called ballball called strikeABS overturnedABS upheld

The calls that moved the game

  1. 1+0.694 · 3-2 strike called ball
    Jhonny Pereda vs Jeffrey Springs
  2. 2-0.301 · 3-1 ball called strike
    Rob Refsnyder vs Jeffrey Springs
  3. 3+0.133 · 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 the ABS system’s own measurement — Hawk-Eye optical ball-tracking, not our model.

  1. 1Jhonny Pereda — ump said ball, robot ruled ball: upheld.
  2. 2Jonah Heim — ump said ball, robot ruled strike: overturned.
  3. 3Jhonny Pereda — ump said ball, robot ruled ball: upheld.

Our tracked-rulebook zone matched the ABS ruling on 3 of 3 — a zone-definition gap (ABS grades a standardized, height-based zone), not our error.

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