Blue Notes · Umpire Grade2026-04-18
BAL @ CLE
Home plate: Mark Wegner
“An honest evening's grade: nothing loud, nothing missed by much.”
Umpire Grade
95.0% accurate
Run Favor
runs, CLE
ABS Overturns
of 2 reviewed
What this shows — how Mark Wegner called the 141 pitches that were taken (no swing), graded against the tracked rulebook strike zone. He got 134 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
- 1-0.28▲7 · 1-2 ball called strike
Samuel Basallo vs Gavin Williams - 2+0.23▲6 · 0-2 strike called ball
Colton Cowser vs Gavin Williams - 3+0.13▼2 · 1-1 strike called ball
Rhys Hoskins vs Dean Kremer
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
2 pitches went to the robots · 0 overturned (ump overruled) · 2 upheld (ump confirmed). This is Hawkeye ground truth, no model involved.
- 1Samuel Basallo — ump said ball, robot ruled ball: upheld.
- 2George Valera — ump said strike, robot ruled strike: upheld.
Our tracked-rulebook zone matched the ABS ruling on 2 of 2 — a zone-definition gap (ABS grades a standardized, height-based zone), not our error.