Derek Shelton is the First ABS-Related Ejection in MLB History

[Cody Christie]

Major League Baseball spent years testing the automated ball strike system in the minors before finally rolling it out at the big league level in 2026. The early days of any new rule come with a learning curve, and on Sunday, that adjustment period produced a moment that will live in the record books.

Twins manager Derek Shelton became the first manager to be ejected in Major League Baseball history over an ABS-related dispute. The moment came in the ninth inning of Minnesota’s 8-6 loss against Baltimore, and it unfolded in a way that perfectly captures both the promise and the confusion surrounding the league’s newest technology.

With two outs and the Twins mounting a potential rally, Ryan Helsley appeared to issue a walk to Josh Bell. That would have brought the tying run aboard and shifted the pressure squarely onto Baltimore. Instead, Helsley signaled for a challenge, tapping his hat to trigger the ABS system. The call was overturned to a strikeout, abruptly ending Bell’s plate appearance and changing the complexion of the inning.

Shelton immediately took issue, not necessarily with the result of the challenge, but with its timing. Under MLB’s ABS guidelines, players must initiate a challenge almost instantly after the umpire’s call. The unofficial benchmark has been about two seconds, leaving little room for hesitation. In real time, Helsley’s motion looked quick, but Shelton clearly saw it differently from the dugout.

"I didn't think Helsley tapped his hat quick enough," Shelton said after the game. "Maybe he did, maybe he didn't. But I didn't feel he did. I feel it's gotta be something that's in the three seconds and I didn't think it was there. But the umpiring crew thought it was."

The disagreement escalated quickly, and Shelton was tossed, cementing his place in MLB history as the first casualty of the ABS era.

From Helsley’s perspective, the sequence was not as clear-cut either.

"I understood where he was coming from, because I felt like the umpire didn't see me right away and so I was kind of confused," he said after the game. "(Home plate umpire Laz Díaz) behind me kind of took up for him. He was like, 'He did it right away,' which I know we're probably going to go through some growing pains with this since it's so new and I think we saw that today. And I can respect Shelton for trying to not get him to do it there, because it did seem like it was a little long in that moment."

That last part might be the most important takeaway. MLB’s ABS system is designed to eliminate missed calls, but it introduces a new layer of subjectivity in how and when challenges are initiated. What feels immediate to one person may look delayed to another, especially in a high-leverage situation with the game on the line.

The inning did not end quietly after the ejection. The next batter reached on an error, briefly extending Minnesota’s hopes, but Helsley regrouped and induced a game-ending flyout to shut the door.

MLB and the ABS system will have some kinks in the season’s early weeks. Shelton’s ejection might be just the first step as the league and teams adjust to a new normal.

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[Sjoski]

Twins start and ABS system:

- Sheldon ejected 

- Bell walk overturned by millimeters 

- Wallner's challenge was the worst of the weekend according to Espn....not even close. 

 

 

 

[Jkeady12]

Which is pretty amazing since I bet there are less than 25 a year. The only thing to argue is whether a challenge gets granted or not. I guess once they are out of challenges then you might argue a call. Then you will just get " your players should of saved their challenges " from the ump.

[Jack Pine]

It's going to happen eventually.  All pitches will be called electronically and quick flashed to the umpire who will then make the call.

[The Great Hambino]

I'm not surprised to see something like this go down as everyone figures out the process.  I wonder if in the confusion, Helsley signaled it twice and Shelton only saw the second, later signal.

To me, the only surprising aspect of all this is that the first manager ejected in such a fashion wasn't Aaron Boone

[Richie the Rally Goat]

7 hours ago, The Great Hambino said:

I'm not surprised to see something like this go down as everyone figures out the process.  I wonder if in the confusion, Helsley signaled it twice and Shelton only saw the second, later signal.

To me, the only surprising aspect of all this is that the first manager ejected in such a fashion wasn't Aaron Boone

The first signal looked like it was during his follow through, but looked like he could have been adjusting his hat