Blue Notes · Umpire Grade2026-04-27
STL @ PIT
Home plate: Chris Segal
“The zone kept its promises.”
Umpire Grade
93.2% accurate
Run Favor
runs, PIT
ABS Overturns
of 3 reviewed
What this shows — how Chris Segal called the 133 pitches that were taken (no swing), graded against the tracked rulebook strike zone. He got 124 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+0.23▲7 · 0-2 strike called ball· challenged ✓
Jordan Walker vs Isaac Mattson - 2-0.20▲8 · 2-1 ball called strike
José Fermín vs Gregory Soto - 3-0.13▲7 · 1-0 ball called strike
Iván Herrera vs Evan Sisk
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
3 pitches went to the robots · 2 overturned (ump overruled) · 1 upheld (ump confirmed). This is the ABS system’s own measurement — Hawk-Eye optical ball-tracking, not our model.
- 1Thomas Saggese — ump said strike, robot ruled ball: overturned.
- 2Henry Davis — ump said ball, robot ruled strike: overturned.
- 3Nick Gonzales — ump said strike, robot ruled strike: upheld.
Our tracked-rulebook zone matched the ABS ruling on 3 of 3 — a zone-definition gap (ABS grades a standardized, height-based zone), not our error.