Fever BaseballFor collectors and stat nerdsFuture Value Radar (FVR) · On the record
Blue Notes · Umpire Grade2026-08-20

ATH @ KC

Home plate: Cory Blaser

A steady night's work behind the plate.

A
Umpire Grade
95.7% accurate
0.6
Run Favor
runs, KC
3
ABS Overturns
of 5 reviewed

What this shows — how Cory Blaser called the 186 pitches that were taken (no swing), graded against the tracked rulebook strike zone. He got 178 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: Michael Massey — the ump called it a strike, the robot ruled strike (upheld — ump confirmed).1Challenge 2: Brian Serven — the ump called it a strike, the robot ruled ball (OVERTURNED — ump overruled).2Challenge 3: Darell Hernaiz — the ump called it a ball, the robot ruled strike (OVERTURNED — ump overruled).3Challenge 4: Zack Gelof — the ump called it a ball, the robot ruled strike (OVERTURNED — ump overruled).4Challenge 5: Luke Maile — the ump called it a ball, the robot ruled ball (upheld — ump confirmed).5
strike called ballball called strikeABS overturnedABS upheld

The calls that moved the game

  1. 1-0.305 · 3-1 ball called strike
    Max Muncy vs Carlos Duran
  2. 2-0.133 · 1-0 ball called strike
    Vinnie Pasquantino vs Gage Jump
  3. 3-0.138 · 1-0 ball called strike
    Darell Hernaiz vs John Schreiber

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

5 pitches went to the robots · 3 overturned (ump overruled) · 2 upheld (ump confirmed). This is the ABS system’s own measurement — Hawk-Eye optical ball-tracking, not our model.

  1. 1Michael Massey — ump said strike, robot ruled strike: upheld.
  2. 2Brian Serven — ump said strike, robot ruled ball: overturned.
  3. 3Darell Hernaiz — ump said ball, robot ruled strike: overturned.
  4. 4Zack Gelof — ump said ball, robot ruled strike: overturned.
  5. 5Luke Maile — ump said ball, robot ruled ball: upheld.

Our tracked-rulebook zone matched the ABS ruling on 2 of 5 — a zone-definition gap (ABS grades a standardized, height-based zone), not our error.

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