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

416

events captured

Overturned

223

calls flipped by ABS

League Overturn Rate

53.6 %

of all challenges

Plate Umpires

tracked this season

Last Game

2026-09-11

most recent ingest

Trends, patterns & fun facts

The catcher knows best

59.5 %

Catchers win 59.5% of the challenges they call. Pitchers? Just 16.7%. Don't waste your challenges on what the guy on the mound thinks.

ABS is pitcher-friendly

+ 20

Net strikeouts added by overturned challenges. ABS has handed pitchers 20 more K's than it's taken away — and removed 12 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

LAD

The LAD 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 (223) Confirmed (193) 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 68 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

WSH @ LAD

+1.009

Run-value swing

Smith, Will at the plate, Sinclair, Jack pitching · inning 8 · 3-2 count
Original call: ball → ABS: strike · challenged by catcher

⚡ STRIKEOUT ADDED

HP: Rob Drake · Sep 5

NYY @ SD

+0.984

Run-value swing

France, Ty at the plate, Fulmer, Michael pitching · inning 6 · 3-2 count
Original call: ball → ABS: strike · challenged by catcher

⚡ STRIKEOUT ADDED

HP: Alex MacKay · Sep 5

ATL @ PHI

+0.978

Run-value swing

Dubón, Mauricio at the plate, Wheeler, Zack pitching · inning 1 · 2-2 count
Original call: ball → ABS: strike · challenged by catcher

⚡ STRIKEOUT ADDED

HP: Todd Tichenor · Sep 5

SF @ NYM

+0.931

Run-value swing

Baty, Brett at the plate, Seymour, Carson pitching · inning 7 · 2-2 count
Original call: strike → ABS: ball · challenged by batter

⚡ STRIKEOUT REMOVED

HP: Jeremie Rehak · Sep 5

TB @ ATL

+0.931

Run-value swing

Riley, Austin at the plate, Peralta, Freddy pitching · inning 1 · 2-2 count
Original call: ball → ABS: strike · challenged by catcher

⚡ STRIKEOUT ADDED

HP: Lance Barrett · Sep 8

AZ @ HOU

+0.713

Run-value swing

Walker, Christian at the plate, Rodriguez, Eduardo pitching · inning 6 · 3-2 count
Original call: ball → ABS: strike · challenged by catcher

⚡ STRIKEOUT ADDED

HP: Edwin Jimenez · Sep 6

NYM @ NYY

+0.713

Run-value swing

Vientos, Mark at the plate, Headrick, Brent pitching · inning 8 · 3-2 count
Original call: strike → ABS: ball · challenged by batter

⚡ STRIKEOUT REMOVED

HP: Nick Mahrley · Sep 11

TB @ TEX

+0.713

Run-value swing

Carter, Evan at the plate, Kelly, Kevin pitching · inning 4 · 3-2 count
Original call: ball → ABS: strike · challenged by catcher

⚡ STRIKEOUT ADDED

HP: Derek Thomas · Sep 6

AZ @ KC

+0.634

Run-value swing

Arenado, Nolan at the plate, Cruz, Steven pitching · inning 10 · 2-2 count
Original call: strike → ABS: ball · challenged by batter

⚡ STRIKEOUT REMOVED

HP: Ryan Wills · Sep 8

#10

CHC @ MIA

+0.633

Run-value swing

Caissie, Owen at the plate, Palencia, Daniel pitching · inning 8 · 3-2 count
Original call: ball → ABS: strike · challenged by catcher

⚡ STRIKEOUT ADDED

HP: Ben May · Sep 6

#11

TEX @ SEA

+0.633

Run-value swing

Raleigh, Cal at the plate, Bradford, Cody pitching · inning 2 · 3-2 count
Original call: strike → ABS: ball · challenged by batter

⚡ STRIKEOUT REMOVED

HP: Junior Valentine · Sep 9

#12

TEX @ AZ

+0.589

Run-value swing

Burger, Jake at the plate, Kelly, Merrill pitching · inning 2 · 2-2 count
Original call: strike → ABS: ball · challenged by batter

⚡ STRIKEOUT REMOVED

HP: Brian Walsh · Sep 11

Latest overturned calls

No Results

Page / 2 10 of 20 records

Every challenge

No Results

Page / 21 20 of 416 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.