MLB approves robot umpires for 2026 as part of challenge system
59 comments
·September 23, 2025iambateman
Remarkably, the television wasn’t the technology that forced the MLB’s hand on this. You would think it would…football and tennis went for challenges a long time ago, and viewers can easily see when an ump misses a call. But baseball has managed to stay human on balls and strikes for a long time.
Then along comes sports betting and they basically have no choice but to use robots.
It’s sad to me how much sports betting changes sports. When I watch, I wonder if the referee has accepted a bribe every time a call is a little funky. Considering the millions of dollars riding on every play, some of them must have taken some money at some point.
dylan604
> When I watch, I wonder if the referee has accepted a bribe every time a call is a little funky.
As someone that has been a soccer (makes me throw up a little to say that word), ahem, football referee, I can tell you that not all funky calls are because the ref is rigging the game. Sometimes, you just miss stuff. Sometimes, you just see it differently. Sometimes, you just fuck up. Yes, a few have definitely admitted to taking bribes. Granted, I never was an official on anything professional. Even still, you'd make a call and the fans of the team you call a foul against all go crazy. Two minutes later, you make a call going the other way, and the other fans go nuts. I always laughed when I'd hear comments about needing glasses and "how much they pay you". You can't make 100% happy, ever. Fan is short for fanatic, and it's very appropriate.
To that end, I'm surprised that MLB never introduced replays. Cricket has replays and even have microphones that they watch the waveforms to see if there was contact or not.
comex
They already did introduce replays:
https://en.wikipedia.org/wiki/Instant_replay_in_Major_League...
But replays weren’t allowed for balls and strikes, the subject of the new system.
bluGill
They tried replays 50 years ago and the umpires refused to budge and so they banned them so fans couldn't know.
the above is from https://en.m.wikipedia.org/wiki/Ron_Luciano 's book but wikipedia doesn't mention it. Though it was 40 years since I read the book so maybe I don't remember right?
I think it makes the game human. also football with replays on ever play is too slow.
spindump8930
It was mentioned elsewhere in the thread but this article is relevant: https://www.cbssports.com/mlb/news/guardians-reliever-emmanu...
The ability to bet on short term individual events (such as a single pitch) means that even a single pitch, otherwise nearly inconsequential, can be abused.
edoceo
We're so far from The Sandlot the game has lost all passion. (Go A's)
RhysU
The current state is such first-order thinking. When will we be able to bet on whether or not the umps have taken a bribe?
syndacks
How did you come to that conclusion that this is a function of betting? As a baseball fan, this feels like a long overdue feature (at least in the world of video review challenge). I think it's simply going to make the game better. MLB is losing to the NFL/NBA, and they need to put out a better product.
tw04
They’ve had the technology for over 20 years. The only thing that’s changed in the last 5 is betting.
AdieuToLogic
> They’ve had the technology for over 20 years. The only thing that’s changed in the last 5 is betting.
What has not changed since before both of those timelines is baseball umpires have a union[0].
Maybe, just maybe, their union fought the introduction of this to the bitter end.
0 - https://en.wikipedia.org/wiki/Major_League_Baseball_Umpires_...
lbotos
Manfred (Commissioner) started 10 years ago.
He oversaw the last collective bargaining agreement in 2021/22. It’s expiring this year. That’s one of the reasons why the rule change is going through now.
I won’t deny that sports betting could be a factor, but Manfred wants faster more engaging baseball. That’s been his stated goal for a long time as he worked through rule changes.
SapporoChris
I couldn't count the number of things that have changed in the last five years. However, related to Baseball here's a small list to start. https://www.baseball-almanac.com/rulechng.shtml
ShroudedNight
There's also Angel Hernández retiring.
gxs
Yeah - I like how no one ever talks about Tim Donaghy
It’s sort of been swept under the rug even though it was initially reported on
Professional NBA referee betting on games he was refereeing - what a joke
squigz
Is sports betting new?
theluketaylor
Betting as a major sponsor and league endorsed? Yes, very new.
We've come a long way from the black sox and Pete Rose being banned for life over gambling
https://en.wikipedia.org/wiki/Black_Sox_Scandal https://en.wikipedia.org/wiki/Pete_Rose#Permanent_ineligibil...
popularrecluse
It's only a matter of time before we're right back there.
mcmcmc
Online/mobile sports betting is relatively new, was only legalized in the last decade. It’s grown massively in popularity
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IncreasePosts
Legalized, league-approved sport betting is new-ish (2018). And sports betting has grown 25x since then.
Not sure if I agree with OPs take though. It might just be that baseball is a traditional, conservative game and they are hesitant to change it. maybe that's why they're just using robo umps for challenges, and not for every pitch, which would be easy to do and would further the all-about-betting theory.
Spivak
Legal sports betting via app which turned gambling into a casual activity for hundreds of millions of new players. These apps made a market that previously placed 4 billion in bets to 125 billion. This is very new.
Their rise and market is so large that only 5% of sports bets aren't placed through one of these apps.
14
It is almost impossible to fully remove that voice in the back of your head that will question if you were cheated. Because the fact is at the end of the day sports are played by humans and humans make mistakes, humans are susceptible to bribes, humans are susceptible to threats and there are many other factors that could influence or force cheating by players or bad calls by the officials.
There are literally countless incidents of people cheating. So my suggestion is to hope it doesn't happen but also just avoid making bets if you are not comfortable with the fact that you may lose.
jcalvinowens
Nothing makes me feel more like a grumpy old man than the new strike zone box. My favorite part of watching a baseball game with friends was the heated arguments about what was or wasn't a strike.
I realize that it's an objectively ridiculous thing to have strong feelings about, but boy do I hate it :D
YesBox
I started watching baseball 5 years ago when I had a roommate who loves the Red Sox. I don't have cable at home so I cant say Im a true fan or anything; but if its on and I happen to be in front of a TV, Im content watching a game.
At the time, every umpire had their own strike box, and I loved it! It added variance to the pitches and swings each game. Some batters would turn their head and confirm with the umpire where one edge of the box was when they called a strike (and others would silently curse without turning their head haha)
Loughla
No, I'm with you. And maybe it's just because I'm an old man, but this is another place where joy and wonder (meaning arguing with friends lol) are replaced with data. It just sucks some of the fun out.
The quest for eternal optimization is exhausting.
Spivak
In a very literal sense a non-trivial part of the entertainment value of sports has been taken from you. I don't think it's ridiculous at all, I think the people making the decisions to have computer accurate refs don't understand what makes sports fun to watch holistically.
vessenes
Overall this seems good to me, esp. since it’s limited to 2x a game, leaving space for framing and other human elements to the calling, like make up calls, which I generally think are good.
That said. Strike zone height is between 53.5% and 23% of a player’s height. WTFBBQ. That’s a major change, and I don’t understand how it’s going to go with an Ump’s calling the zone — right now a player’s stance can affect the zone height. How will umps assess 53.5% of a player’s height realtime?
dyauspitr
Cricket has already been through this and it has only improved the game and made it more fair.
NaOH
Some numbers: A typical MLB game sees about 292 pitches thrown. Of the pitches called a ball or strike—so ignore any pitches fouled off or put in play—93% are called correctly by umpires. That's equivalent to umpires missing a call every 3.6 batter appearances.
So in terms of volume, this isn't much. In terms of potential effects, it becomes a question of how well players utilize their teams' two challenges (teams retain challenges if they correctly use them, but only the batter, the catcher, and the pitcher can request a challenge).
It all becomes an interesting question in terms of strategies. A catcher when he's batting? Does he want to risk one of his team's challenges as a batter that he might want for his pitcher? A mediocre hitter in a low-stakes situation? Does he want to risk one of his team's challenges? What about a really good hitter in a low-stakes situation? Lots here for teams to consider, and since it's up to the players to decide on a challenge (not managers or coaches), teams will have to determine their approaches such that players can make decisions without assistance.
evdubs
This obscures the fact that umpires are worse than 93% when the pitch is close to the boundary of being a ball or a strike (shadow zone). Obvious balls and obvious strikes are obvious, but umpire accuracy when it is close is only 81%, and their accuracy was even worse 15 years ago.
https://blogs.fangraphs.com/strike-three-lets-check-in-on-um...
jackconsidine
Safe to assume ejections will fall off dramatically. I remember Lou Pinella being thrown out of Wrigley Field because a runner was called out at 3rd base a few years before challenges. Pinella was wrong and in another world he would have simply challenged the call rather than kicking dirt at the ump. Wilson Contreras got thrown out a few weeks back for theatrics after a ball / strike call.
The last frontier of ejections will probably be discretion when players get plunked at the plate.
jake-qwokka
It's been pretty wild to watch the MLB go through the exact same arguments that the Cricket world went through 15 years ago when DRS was first introduced.
The game will be fine.
ra7
There’s universal agreement that DRS has massively improved cricket, but the sport was already using technology for decision-making well before DRS. In fact, Hawk-Eye was first used in cricket before gaining popularity with tennis. I’d go as far as to say cricket has been the best adopter of technology in sports for a long time.
abhinavk
It's a net positive but wide/no-ball DRS slows down the game a lot.
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ryoshu
Optimize everything so you can take the soul out of it.
prawn
Look at it from the other direction. If there was a contest between two athletes or teams and it was adjudicated without bias, would you think "You know what would give this more soul? A flawed judge with poorer vision, who may or may not have been pressured or baited before the game to influence their decisions!"
Review systems for cricket and tennis seem to have enabled more crowd involvement and anticipation in the lead up to a decision being revealed.
JumpCrisscross
You could turn it into a meta game. Teams of umpires :P
SmellTheGlove
Tape to Tape has a team of refs as an opponent if hockey is your thing!
asdfwaafsfw
If the viewers didn't know it was a blown call, there wouldn't be a problem. That's how baseball worked for 100 years.
But now when the viewers can see the pitch in 1000fps 8K slow motion, they expect better from the umpires. The entire premise of sports relies on the assumption that the rules are adjudicated correctly.
Loughla
The entire premise of sports relies on the assumption that the rules are adjudicated fairly.
Part of the soul of the game is learning the umpire's particular strike zone and adjusting accordingly.
I'm with OP. Fun is being replaced by data.
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jayrot
Bad calls are not “soul”. There’s plenty of flair and tradition and flavor in baseball.
spike021
if a baseball is the width of two or three baseballs away from the "zone" (dynamic based on player usually), then providing a way to challenge the call (it was called a strike when it is clearly a ball) is completely fair and retains the soul of the game. Baseball is really a game of fairness. There's no "buzzer beaters" or timed sessions. Everyone has their chance per inning to impact the game. In a game of relative fairness, adding more strict honesty when it comes to something like this will only improve the game.
MontagFTB
As a baseball fan, I for one welcome this change. I have seen how the system dramatically improved tennis matches. Players have built an implicit trust in the calls, and the game is more about the athleticism on display than ever before.
theluketaylor
I'm a huge fan of the automatic balls and strikes challenge system baseball is going to adopt.
Awful calls need to be struck from the game and this should do that. Tonight my Blue Jays had a double taken away on a foul call and a ball 2 inches off the plate called a strike in the same at bat with the bases loaded. Between this and the horrible reviews last week it feels like the fix is by MLB to keep us from winning the division.
Unlike tennis where in and out have always been strictly defined and we just didn't have the technology to enforce it, baseball has always involved the human element to the strike zone and some umpire judgement on whether the pitcher hit the spot or just got lucky and what a given batter's zone is. I want some of that to stay, with catchers holding game-long discussions about the zone with umpires, and batters having their own sense of the zone.
I don't want full automatic balls and strikes, so I like the challenge. There is some new strategy on when to deploy it and who can be trusted to recognize a missed call. It leaves some room for a pitcher and catcher to work a corner over a few innings to expand little by little.
spike021
I think as long as they use the limited challenge system, framing skills can still co-exist and matter.
I only hope they don't switch to a system entirely governed by an automated strike zone without umps.
It'll allow the "human element" many players still prefer along with some level of framing, while keeping umps honest (there are way too many egregious calls these days).
pseudolus
Bit deceptive. Not robots, just a glorified camera tracking system.
mbb70
'robot' meaning 'automated/non-human', a common English idiom especially in non-technical contexts
nextworddev
Guess we don’t care about AI taking jobs as long as it’s not developer jobs
jrockway
I'm only a casual baseball viewer, but balls and strikes are so easy to see on TV and the umpires miss a lot of obvious calls. It makes a lot of sense to make this a game mechanic that is managed by the machine, rather than requiring humans to judge this. Humans are still judging baserunning and the more subjective aspects of the game.
I'll also note that MLB isn't doing the "replace umpires with software". Teams get 2 challenges to use, and those are adjudicated by robots. The initial call is made by humans and a human has to say "use my finite resource to engage the robots". (I would just make all calls by robot and have a challenge to have humans look at it, but whatever. Baby steps. We know where this is going.)
The NFL uses the same technology to measure first downs now. No more carrying the chains out to measure by hand. But the officials still spot the ball where they think they play ended, so the computer isn't doing anything important. It's just doing the tedious part.
Nobody is losing their job and no fun is being removed from the game.
Dylan16807
If this is a joke, sorry, I'm just tired of it.
If it's not a joke, please realize this doesn't replace anyone and is also not doing anything that's meaningfully "AI".
They had this during spring training and it was fantastic. The challenge limit meant it was used rarely, but when it was used it added a fun dramatic element. Players getting to stick it to umpires when they got it wrong, and umpires getting to smirk at players when they got it right.
And at the end of it all, some missed calls get to be corrected.