MLB ABS Umpire Tracker

Every Automated Ball-Strike challenge in the 2026 MLB regular season, joined to the home-plate umpire who made the original call. Refreshed daily after the last game.

ABS Challenges

425

events captured

Overturned

220

calls flipped by ABS

League Overturn Rate

51.8 %

of all challenges

Plate Umpires

tracked this season

Last Game

2026-08-21

most recent ingest

Trends, patterns & fun facts

The catcher knows best

54.2 %

Catchers win 54.2% of the challenges they call. Pitchers? Just 63.6%. Don't waste your challenges on what the guy on the mound thinks.

ABS is pitcher-friendly

+ 8

Net strikeouts added by overturned challenges. ABS has handed pitchers 8 more K's than it's taken away — and removed 1 walks on balance.

First-pitch ambush

66.7 %

The 0-1 count is challenged most often AND overturned at 66.7%. Hitters and catchers are leading off at-bats with high-confidence challenges.

Sharpest challengers

MIN

The MIN lead the league with a 70% challenge-success rate (minimum 8 attempts). Their bench knows when to pull the trigger.

The shadow zone — every overturned pitch, on the plate

Catcher's view. Each dot is a pitch the umpire called that ABS later ruled on. Red dots were overturned (umpire missed it); gray dots were confirmed (umpire got it right). The rectangle is the ABS strike zone (17″ wide, normalized to batter height).

Overturned (220) Confirmed (205) ABS strike zone

Reading the plate. Red dots inside the dashed zone = umpire called a ball on a strike — pitcher won that challenge. Red dots outside the dashed zone = umpire called a strike on a ball — batter won. Notice the cluster of red just outside the right edge: those are the famous "off-the-plate" called strikes that catchers know to challenge. Heart-of-plate is mostly gray because heart-of-plate calls are rarely close enough to challenge.

League distribution

Full leaderboard

🚨 = ≥65% overturned (8+ challenges) ⚠️ = ≥60% overturned (5+ challenges) Reliable % = Wilson 95% lower bound — corrects for small samples RV swing = absolute run-value change from overturned calls

No Results

Page / 3 25 of 71 records

Why two percentages? Raw % treats a 1-of-1 the same as a 25-of-50 — both show 100% / 50%. The Reliable % column applies the Wilson 95% confidence lower bound, which shrinks small-sample numbers toward the league mean. Sort by Reliable % to see which umpires the ABS system is correcting consistently, not just occasionally with luck.

The fair view — accuracy on every called pitch

Challenge data only covers ~5% of pitches and is biased toward calls players think are wrong. The view below is built from every called pitch in 2026 (104,000+), classified against the ABS strike zone independently. This is the unbiased accuracy metric.

No Results

Page / 7 15 of 91 records

What "stolen strikes" means. A called strike on a pitch that the ABS zone says was a ball — the umpire gave the pitcher a strike that wasn't there. Lost strikes = the inverse (ball called on a pitch in the zone). The Net bias column is positive when the umpire systematically favors pitchers (stolen − lost). Across MLB, stolen strikes outnumber lost strikes ~20-to-1 — umpires are pitcher-friendly, and ABS now measures by how much.

Biggest moments of the season

SD @ NYM

+1.156

Run-value swing

Ewing, A.J. at the plate, Ray, Robbie pitching · inning 2 · 3-2 count
Original call: strike → ABS: ball · challenged by batter

⚡ STRIKEOUT REMOVED

HP: Laz Diaz · Aug 18

MIA @ PHI

+0.781

Run-value swing

Realmuto, J.T. at the plate, Vodnik, Victor pitching · inning 7 · 3-2 count
Original call: strike → ABS: ball · challenged by batter

⚡ STRIKEOUT REMOVED

HP: Tyler Jones · Aug 17

DET @ PIT

+0.781

Run-value swing

Clark, Max at the plate, Soto, Gregory pitching · inning 8 · 3-2 count
Original call: ball → ABS: strike · challenged by catcher

⚡ STRIKEOUT ADDED

HP: Ben May · Aug 17

WSH @ MIA

+0.713

Run-value swing

Marsee, Jakob at the plate, Lord, Brad pitching · inning 3 · 3-2 count
Original call: ball → ABS: strike · challenged by catcher

⚡ STRIKEOUT ADDED

HP: Rob Drake · Aug 21

CIN @ AZ

+0.704

Run-value swing

Waldschmidt, Ryan at the plate, Johnson, Pierce pitching · inning 7 · 1-2 count
Original call: ball → ABS: strike · challenged by catcher

⚡ STRIKEOUT ADDED

HP: Dan Bellino · Aug 21

ATH @ HOU

+0.680

Run-value swing

Varsho, Daulton at the plate, Ginn, J.T. pitching · inning 1 · 1-2 count
Original call: ball → ABS: strike · challenged by catcher

⚡ STRIKEOUT ADDED

HP: Jonathan Parra · Aug 21

AZ @ BOS

+0.633

Run-value swing

Perdomo, Geraldo at the plate, Suarez, Ranger pitching · inning 2 · 3-2 count
Original call: strike → ABS: ball · challenged by batter

⚡ STRIKEOUT REMOVED

HP: D.J. Reyburn · Aug 18

CHC @ SEA

+0.633

Run-value swing

Rodriguez, Julio at the plate, Rea, Colin pitching · inning 8 · 3-2 count
Original call: ball → ABS: strike · challenged by catcher

⚡ STRIKEOUT ADDED

HP: Brennan Miller · Aug 21

ATH @ KC

+0.613

Run-value swing

Massey, Michael at the plate, Perkins, Jack pitching · inning 5 · 3-2 count
Original call: strike → ABS: ball · challenged by batter

⚡ STRIKEOUT REMOVED

HP: Andy Fletcher · Aug 18

#10

COL @ SF

+0.613

Run-value swing

Beck, Jordan at the plate, Winn, Keaton pitching · inning 7 · 3-2 count
Original call: strike → ABS: ball · challenged by batter

⚡ STRIKEOUT REMOVED

HP: Brian Walsh · Aug 16

#11

COL @ SF

+0.589

Run-value swing

Moniak, Mickey at the plate, Webb, Logan pitching · inning 3 · 2-2 count
Original call: ball → ABS: strike · challenged by pitcher

⚡ STRIKEOUT ADDED

HP: John Bacon · Aug 15

#12

NYY @ BAL

+0.546

Run-value swing

Holliday, Jackson at the plate, Rodon, Carlos pitching · inning 2 · 0-2 count
Original call: ball → ABS: strike · challenged by catcher

⚡ STRIKEOUT ADDED

HP: Will Little · Aug 18

Latest overturned calls

No Results

Page / 2 10 of 20 records

Every challenge

No Results

Page / 22 20 of 425 records

About this dashboard. The MLB Automated Ball-Strike Challenge System debuted league-wide in the 2026 season. Each team gets two challenges per game (kept on success, lost after two failures). Only batters, pitchers, and catchers may challenge. The ABS strike zone is 17″ wide, 53.5% of batter height at top, 27% at bottom, measured at the middle of the plate.

Reading note. Overturn rate is a biased sample — players only challenge ~5% of pitches, and they prefer to challenge calls they think are wrong. A high overturn % means an umpire is being challenged successfully when challenged — not that they're miscalling every pitch. For the fairer per-pitch accuracy view, ingest Statcast pitch data with abs-umpires daily-refresh --with-statcast.

Sources. Event data: Savant /abs page (vizChallenges). Umpire crews: MLB StatsAPI schedule?hydrate=officials. Refreshed daily at 10:00 UTC.