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Blue Notes · Umpire Grade2026-04-29

CHC @ SD

Home plate: Mark Ripperger

“Reliable as a Tuesday: no complaints, no headlines.”

B+
Umpire Grade
93.1% accurate
0.3
Run Favor
runs, CHC
4
ABS Overturns
of 6 reviewed

What this shows — how Mark Ripperger called the 160 pitches that were taken (no swing), graded against the tracked rulebook strike zone. He got 149 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: Luis Campusano — the ump called it a ball, the robot ruled strike (OVERTURNED — ump overruled).1Challenge 2: Miguel Amaya — the ump called it a ball, the robot ruled strike (OVERTURNED — ump overruled).2Challenge 3: Miguel Amaya — the ump called it a ball, the robot ruled ball (upheld — ump confirmed).3Challenge 4: Luis Campusano — the ump called it a ball, the robot ruled ball (upheld — ump confirmed).4Challenge 5: Manny Machado — the ump called it a strike, the robot ruled ball (OVERTURNED — ump overruled).5Challenge 6: Freddy Fermin — the ump called it a ball, the robot ruled strike (OVERTURNED — ump overruled).6
strike called ballball called strikeABS overturnedABS upheld

The calls that moved the game

  1. 1+0.39▲9 · 2-2 strike called ball· challenged ✓
    Ian Happ vs Mason Miller
  2. 2-0.28▼6 · 1-2 ball called strike· challenged ✓
    Manny Machado vs Jameson Taillon
  3. 3+0.13▼2 · 1-0 strike called ball· challenged ✓
    Xander Bogaerts vs Jameson Taillon

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

6 pitches went to the robots · 4 overturned (ump overruled) · 2 upheld (ump confirmed). This is the ABS system’s own measurement — Hawk-Eye optical ball-tracking, not our model.

  1. 1Luis Campusano — ump said ball, robot ruled strike: overturned.
  2. 2Miguel Amaya — ump said ball, robot ruled strike: overturned.
  3. 3Miguel Amaya — ump said ball, robot ruled ball: upheld.
  4. 4Luis Campusano — ump said ball, robot ruled ball: upheld.
  5. 5Manny Machado — ump said strike, robot ruled ball: overturned.
  6. 6Freddy Fermin — ump said ball, robot ruled strike: overturned.

Our tracked-rulebook zone matched the ABS ruling on 5 of 6 — a zone-definition gap (ABS grades a standardized, height-based zone), not our error.

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