MLB Umpires: Home-Plate Stats and Scoring

Every home-plate umpire, 2026 regular season

Runs per game in the games each umpire worked behind the plate, and how often those games finished above the league scoring average of 8.96 runs. Minimum 15 games.

Source: MLB Stats API (statsapi.mlb.com). 2026 regular season unless marked otherwise. Updated Oct 6, 2026, 4:51 AM ET. Scoring in an umpire's games also depends on the teams, parks and pitchers he happened to draw.

Every MLB game has one person whose judgment touches almost every pitch: the home-plate umpire. He calls somewhere around 150 pitches a night, and roughly half of them are taken rather than swung at, so his idea of where the strike zone ends quietly shapes counts, walks, strikeouts and pitch counts. The table above shows runs per game in the games each umpire has worked behind the plate this regular season, how often those games finished above the league scoring average, and, when MLB has posted them, who is working the plate on the next slate. Before you lean on any of it, here is what the numbers can and cannot tell you.

How a home-plate umpire moves scoring

The mechanism is simple. A pitch on the edge of the zone that gets called a strike changes the count, and the count changes everything that follows. Hitters in a 1-2 count are protecting the plate and chasing; hitters in a 2-1 count are looking for something to drive. League-wide, batters do far more damage when they are ahead in the count than when they are behind, so an umpire who gives pitchers a couple of extra inches at the knees or on the corners is effectively tilting dozens of plate appearances toward the pitcher each night.

That tilt shows up in four places. First, called strikes: a generous zone means more of them, especially on the first pitch. Second, walks: fewer full-count pitches are called balls, so fewer batters reach for free. Third, strikeouts: more two-strike counts end with a called third strike. Fourth, pitch counts: when strikes come easier, starters get through innings with fewer pitches and stay in longer, which keeps the weaker middle relievers out of the game.

A tight zone runs the other way. Pitchers have to come into the heart of the plate, walks pile up, starters are at 95 pitches in the fifth inning, and the bullpen gets exposed early. If you have ever watched a game where both starters seemed to be fighting the umpire all night, that is usually what you were seeing.

Real, but small and noisy

Here is the part most umpire tables leave out. The umpire effect exists, but it is modest, and it is buried under a lot of noise.

Start with the sample. A full-time umpire works the plate in roughly 30 to 35 regular-season games a year, and our table requires at least 15 before listing anyone. In baseball terms that is a tiny sample. Runs per game in a single contest can swing from 2 to 20, so an umpire whose games average 9.4 runs over 20 games may simply have caught a few slugfests. Compare that with the league average, which is shown above the table, and the gap between a “high-scoring” umpire and a “low-scoring” one often shrinks toward nothing once you account for chance.

Then there is who he happened to draw. Umpire crews travel through the schedule in blocks, so one umpire might work a week of games in Colorado and Cincinnati while another spends that week in Seattle and San Diego. The first will look like an over machine and the second like an under specialist, and neither number says much about their strike zones. The same goes for pitchers: an umpire who worked the plate for several starts by an elite strikeout pitcher inherits that pitcher’s low run totals. Our ballpark run environment page shows how large park differences can be, and they dwarf most umpire effects.

The honest reading of the table, then, is as a rough signal. A number far from the league average over a large number of games is worth noting. A number slightly above or below it over 16 games is mostly noise.

How the crew rotation works

A regular-season crew has four umpires, and they rotate positions clockwise from one game to the next. The umpire behind the plate in Monday’s game usually works third base on Tuesday, second base on Wednesday and first base on Thursday, then returns to the plate. That means within a series you can often work out who is due behind the plate: it is typically the umpire who was at first base the night before.

The rotation is not set in stone. Umpires take scheduled vacation days during the season, and a replacement umpire can join the crew for a few days. An umpire who takes a foul ball off the mask may leave a game and miss the next one, which reshuffles the order. Crews also change between series, so a three-game set may start with a crew you have not seen in weeks.

When assignments are published

MLB confirms the home-plate umpire for a game on game day, which is when it appears in the official game data. The assignments block above fills in as soon as those names are posted and stays empty until then, which is why an evening check is more useful than a morning one. For a 7:05 pm ET game, the umpire is usually listed well before first pitch, around the same time you are checking the probable pitchers board for late scratches.

If you are building a total or a prop earlier in the day, you can use the rotation to make an educated guess, then confirm once the name is official.

How totals and prop bettors use it, carefully

The umpire is a tiebreaker, not a thesis. A sensible order of work for a game total looks like this: the two starters, then the lineups each will face, then the park and the weather, then the bullpens, and only then the umpire. By the time you reach him, you should already have a number in mind. If the market total is 8.5 and your own estimate is 8.4, a plate umpire whose games have run low over a big sample might tip you toward a small under. If your estimate is 9.2, an umpire should not talk you out of the over.

Strikeout props are where the umpire matters most, because a called third strike is the single most direct thing he controls. Say a starter’s strikeout line is 6.5 at -115 on the over. That price needs 53.5% to break even, and if your projection has him around 6.6 strikeouts, you have almost no edge. An umpire with a notably high called-strike rate might nudge you to 6.8; one with a tight zone might drop you to 6.3 and push you toward a pass. You can check how the price converts to a break-even rate with our odds calculators, and our guide to prop bets covers the other markets that umpires touch, like walks allowed.

First-inning markets feel the umpire too, since a few borderline calls against the leadoff hitter can decide whether an inning gets started at all. Our NRFI page shows first-inning scoring by team and starter, and it is worth reading alongside the plate assignment, not instead of it.

One practical caution: the market already knows who is behind the plate. Popular umpire tendencies are priced into totals by the time most bettors see them, so the value, if any, is small. Set a budget before you bet, only bet if you are 21 or older and it is legal where you are, and call 1-800-GAMBLER if it stops being fun.

What the ABS challenge system changes

MLB has spent several years testing an Automated Ball-Strike system, first in the minor leagues and then in spring training, and the competition committee approved a challenge version for the major leagues beginning with the 2026 season. The umpire still calls every pitch. The batter, pitcher or catcher can challenge a ball or strike call immediately after the pitch, a camera system checks the location in a few seconds, and the call stands or is overturned. Each team starts a game with two challenges and keeps a challenge when it wins one. Our page on MLB rule changes covers how the system fits with the pitch timer and other recent changes.

For bettors, the effect is to trim the extremes. The most costly missed calls, like a strike three on a pitch well off the plate with the bases loaded, can now be reversed. The everyday edge-of-the-zone calls that make up most of an umpire’s tendency are mostly left alone, because teams save their limited challenges for high-leverage counts. Expect the gap between umpires to narrow somewhat rather than disappear, and be wary of umpire numbers from seasons before the system was in place when you compare them with current ones.

Putting it on the card

If you want the umpire in context rather than on his own, the game cards on our baseball picks page show the plate assignment next to the starters, weather and bullpen workload for each game. For the basics of how totals and moneylines are priced, see our guide to reading baseball betting lines, or head back to the baseballbetting.us homepage for every data board. And if you spot an umpire far from the league average over 30-plus games, check the teams and parks he worked before you decide it is him.