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Blue Notes · Umpire Grade2026-04-11

CLE @ ATL

Home plate: Chris Conroy

“The Automated Ball-Strike System put in some overtime here.”

C
Umpire Grade
89.5% accurate
1.1
Run Favor
runs, CLE
5
ABS Overturns
of 8 reviewed

What this shows — how Chris Conroy called the 171 pitches that were taken (no swing), graded against the tracked rulebook strike zone. He got 153 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: Rhys Hoskins — the ump called it a strike, the robot ruled ball (OVERTURNED — ump overruled).1Challenge 2: Jonah Heim — the ump called it a ball, the robot ruled strike (OVERTURNED — ump overruled).2Challenge 3: Austin Hedges — the ump called it a ball, the robot ruled ball (upheld — ump confirmed).3Challenge 4: Jonah Heim — the ump called it a ball, the robot ruled strike (OVERTURNED — ump overruled).4Challenge 5: Jonah Heim — the ump called it a ball, the robot ruled ball (upheld — ump confirmed).5Challenge 6: Jonah Heim — the ump called it a ball, the robot ruled strike (OVERTURNED — ump overruled).6Challenge 7: Ronald Acuña Jr. — the ump called it a strike, the robot ruled strike (upheld — ump confirmed).7Challenge 8: Austin Hedges — the ump called it a ball, the robot ruled strike (OVERTURNED — ump overruled).8
strike called ballball called strikeABS overturnedABS upheld

The calls that moved the game

  1. 1-0.69▼9 · 3-2 ball called strike
    Mike Yastrzemski vs Shawn Armstrong
  2. 2-0.39▲2 · 2-2 ball called strike· challenged ✓
    Rhys Hoskins vs Martín Pérez
  3. 3+0.30▲6 · 3-1 strike called ball· challenged
    Chase DeLauter vs Aaron Bummer

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

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

  1. 1Rhys Hoskins — ump said strike, robot ruled ball: overturned.
  2. 2Jonah Heim — ump said ball, robot ruled strike: overturned.
  3. 3Austin Hedges — ump said ball, robot ruled ball: upheld.
  4. 4Jonah Heim — ump said ball, robot ruled strike: overturned.
  5. 5Jonah Heim — ump said ball, robot ruled ball: upheld.
  6. 6Jonah Heim — ump said ball, robot ruled strike: overturned.
  7. 7Ronald Acuña Jr. — ump said strike, robot ruled strike: upheld.
  8. 8Austin Hedges — ump said ball, robot ruled strike: overturned.

Our tracked-rulebook zone matched the ABS ruling on 7 of 8 — a zone-definition gap (ABS grades a standardized, height-based zone), not our error.

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