Blue Notes · Umpire Grade2026-04-08
PHI @ SF
Home plate: Todd Tichenor
“A steady night's work behind the plate.”
Umpire Grade
94.4% accurate
Run Favor
runs, PHI
ABS Overturns
of 5 reviewed
What this shows — how Todd Tichenor called the 161 pitches that were taken (no swing), graded against the tracked rulebook strike zone. He got 152 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▲8 · 1-2 strike called ball
Bryson Stott vs Blade Tidwell - 2-0.13▲6 · 1-0 ball called strike
Bryson Stott vs Tyler Mahle - 3+0.13▼6 · 1-0 strike called ball
Matt Chapman vs Aaron Nola
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
5 pitches went to the robots · 3 overturned (ump overruled) · 2 upheld (ump confirmed). This is Hawkeye ground truth, no model involved.
- 1Luis Arraez — ump said ball, robot ruled strike: overturned.
- 2Matt Chapman — ump said strike, robot ruled strike: upheld.
- 3Rafael Marchán — ump said strike, robot ruled ball: overturned.
- 4Rafael Marchán — ump said strike, robot ruled ball: overturned.
- 5Patrick Bailey — ump said ball, robot ruled ball: upheld.
Our tracked-rulebook zone matched the ABS ruling on 2 of 5 — a zone-definition gap (ABS grades a standardized, height-based zone), not our error.