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

221

events captured

Overturned

126

calls flipped by ABS

League Overturn Rate

57.0 %

of all challenges

Plate Umpires

tracked this season

Last Game

2026-07-19

most recent ingest

Trends, patterns & fun facts

The catcher knows best

64.4 %

Catchers win 64.4% of the challenges they call. Pitchers? Just 0%. Don't waste your challenges on what the guy on the mound thinks.

ABS is pitcher-friendly

+ 9

Net strikeouts added by overturned challenges. ABS has handed pitchers 9 more K's than it's taken away — and removed 4 walks on balance.

First-pitch ambush

71.4 %

The 0-0 count is challenged most often AND overturned at 71.4%. Hitters and catchers are leading off at-bats with high-confidence challenges.

Sharpest challengers

WSH

The WSH lead the league with a 75% 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 (126) Confirmed (95) 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

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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.

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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

STL @ AZ

+1.828

Run-value swing

Nootbaar, Lars at the plate, Kelly, Merrill pitching · inning 1 · 3-2 count
Original call: ball → ABS: strike · challenged by catcher

⚡ STRIKEOUT ADDED

HP: Bill Miller · Jul 17

TEX @ ATL

+1.430

Run-value swing

Jarvis, Jim at the plate, Quantrill, Cal pitching · inning 2 · 3-2 count
Original call: ball → ABS: strike · challenged by catcher

⚡ STRIKEOUT ADDED

HP: Chris Conroy · Jul 17

MIN @ CHC

+0.713

Run-value swing

Ramirez, Pedro at the plate, Bradley, Taj pitching · inning 2 · 3-2 count
Original call: strike → ABS: ball · challenged by batter

⚡ STRIKEOUT REMOVED

HP: Nate Tomlinson · Jul 18

LAD @ NYY

+0.633

Run-value swing

Betts, Mookie at the plate, Schlittler, Cam pitching · inning 2 · 3-2 count
Original call: ball → ABS: strike · challenged by catcher

⚡ STRIKEOUT ADDED

HP: Rob Drake · Jul 19

MIA @ MIL

+0.633

Run-value swing

Yelich, Christian at the plate, Perez, Eury pitching · inning 6 · 3-2 count
Original call: strike → ABS: ball · challenged by batter

⚡ STRIKEOUT REMOVED

HP: Marvin Hudson · Jul 19

STL @ AZ

+0.633

Run-value swing

Wetherholt, JJ at the plate, Jameson, Drey pitching · inning 4 · 3-2 count
Original call: ball → ABS: strike · challenged by catcher

⚡ STRIKEOUT ADDED

HP: Tyler Jones · Jul 19

WSH @ ATH

+0.613

Run-value swing

Ford, Harry at the plate, Tur, Yunior pitching · inning 6 · 3-2 count
Original call: ball → ABS: strike · challenged by catcher

⚡ STRIKEOUT ADDED

HP: John Libka · Jul 17

WSH @ ATH

+0.613

Run-value swing

Chaparro, Andres at the plate, Lopez, Jacob pitching · inning 1 · 3-2 count
Original call: strike → ABS: ball · challenged by batter

⚡ STRIKEOUT REMOVED

HP: Jacob Metz · Jul 19

WSH @ ATH

+0.511

Run-value swing

Wood, James at the plate, Lopez, Jacob pitching · inning 3 · 2-2 count
Original call: ball → ABS: strike · challenged by catcher

⚡ STRIKEOUT ADDED

HP: Jacob Metz · Jul 19

#10

TB @ BOS

+0.510

Run-value swing

Aranda, Jonathan at the plate, Weissert, Greg pitching · inning 7 · 1-2 count
Original call: ball → ABS: strike · challenged by catcher

⚡ STRIKEOUT ADDED

HP: Alfonso Márquez · Jul 19

#11

CWS @ TOR

+0.429

Run-value swing

Murakami, Munetaka at the plate, Miles, Spencer pitching · inning 1 · 3-2 count
Original call: ball → ABS: strike · challenged by catcher

⚡ STRIKEOUT ADDED

HP: Scott Barry · Jul 17

#12

CIN @ COL

+0.429

Run-value swing

Friedl, TJ at the plate, Feltner, Ryan pitching · inning 3 · 3-2 count
Original call: strike → ABS: ball · challenged by batter

⚡ STRIKEOUT REMOVED

HP: Alex Tosi · Jul 19

Latest overturned calls

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Every challenge

No Results

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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.