Blue Notes · Umpire Grade2026-04-29
CHC @ SD
Home plate: Mark Ripperger
“Reliable as a Tuesday: no complaints, no headlines.”
Umpire Grade
95.6% accurate
Run Favor
runs, SD
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 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
strike called ballball called strikeABS overturnedABS upheld
The calls that moved the game
- 1-0.13▲4 · 1-0 ball called strike
Miguel Amaya vs Matt Waldron - 2+0.13▼5 · 1-0 strike called ball· challenged
Xander Bogaerts vs Jameson Taillon - 3+0.10▲5 · 0-1 strike called ball
Nico Hoerner vs Matt Waldron
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 Hawkeye ground truth, no model involved.
- 1Luis Campusano — ump said strike, robot ruled ball: overturned.
- 2Miguel Amaya — ump said strike, robot ruled ball: overturned.
- 3Miguel Amaya — ump said ball, robot ruled ball: upheld.
- 4Luis Campusano — ump said ball, robot ruled ball: upheld.
- 5Manny Machado — ump said ball, robot ruled strike: overturned.
- 6Freddy Fermin — ump said strike, robot ruled ball: overturned.
Our tracked-rulebook zone matched the ABS ruling on 1 of 6 — a zone-definition gap (ABS grades a standardized, height-based zone), not our error.