Blue Notes · Umpire Grade2026-05-06
SD @ SF
Home plate: Tripp Gibson
“The zone kept its promises.”
Umpire Grade
92.7% accurate
Run Favor
runs, SD
ABS Overturns
of 1 reviewed
What this shows — how Tripp Gibson called the 123 pitches that were taken (no swing), graded against the tracked rulebook strike zone. He got 114 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+0.20▲1 · 2-1 strike called ball
Jackson Merrill vs Adrian Houser - 2-0.19▲7 · 2-0 ball called strike· challenged ✓
Ramón Laureano vs Keaton Winn - 3+0.13▲1 · 1-0 strike called ball
Jackson Merrill vs Adrian Houser
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
1 pitch went to the robots · 1 overturned (ump overruled) · 0 upheld (ump confirmed). This is the ABS system’s own measurement — Hawk-Eye optical ball-tracking, not our model.
- 1Ramón Laureano — ump said strike, robot ruled ball: overturned.
Our tracked-rulebook zone matched the ABS ruling on 1 of 1 — a zone-definition gap (ABS grades a standardized, height-based zone), not our error.