SEATTLE -- The Mariners announced Friday that another player among their active roster to finish the regular season has since undergone offseason surgery.

Michael Arroyo, their promising hitting prospect who was a September callup, underwent an elbow scope procedure on Wednesday with Dr. Keith Meister to clean up cartilage

PEORIA, Ariz. –- When you’ve traveled as much as Boston Smith has in 2026, you’re bound to bump into old friends.

The Mariners’ No. 13 prospect did that twice in the Arizona Fall League on Wednesday, facing White Sox right-handers Mathias Lacombe (who he caught 10 times

SEATTLE -- While the Mariners continue their search for a new manager, a chunk of their player development staff is keeping tabs on their handful of prospects participating in this year’s Arizona Fall League.

Here’s a recap of the action within the organization last week.

**Hitter of the

This story was excerpted from Daniel Kramer’s Mariners Beat newsletter. To read the full newsletter, click here. And subscribe to get it regularly in your inbox.

SCOTTSDALE, Ariz. – The life of a Minor Leaguer can be a transient one. Upward mobility is always a hope, and the possibility of being traded is always there. Mariners No. 13 prospect Boston Smith experienced all of that and then some in his first full year of pro

No matter how you slice it, Kade Anderson was in a league of his own during the 2026 Minor League season.

Look at his raw tools. The 6-foot-2 southpaw is the only prospect in the game with four above-average-or-better pitches -- including two plus offerings -- and 60-grade control.

Look

SEATTLE -- This was the last thing that Kade Anderson and the Mariners wanted to see, especially in an inconsequential game as their season nears its end.

Seattle’s highly touted left-hander was forced to exit during the top of the fourth inning of Saturday night’s <a href="https://www.mlb.com/gameday/823083/final/box"

One of the most pivotal stops in a prospect's development is the High-A level. Top Draft picks out of college often begin their pro journey at High-A, and it's often the level where you can find an organization's best young talent. On Wednesday, Minor League Baseball announced its 2026 High-A

DENVER -- Lazaro Montes delivered the ultimate Coors Field special on Friday night.

And it saved the Mariners from letting another winnable game slip away.

The massive rookie slugger demolished a solo homer into the second deck beyond right field that put Seattle back in front and led to a 5-4

WEST SACRAMENTO – Someone leaned the Mariners’ home run trident -- a gold trophy about 6 1/2 feet tall with three prongs jutting from one end -- against the wall of the trainer’s room in the visitors’ clubhouse. Someone considerate, obviously.

The trident had just been through an exhaustive Saturday night,

With the Double-A and Triple-A playoffs not yet underway, it might be too early to begin assembling the season’s retrospective. But even a cursory glance at the Minor League headlines would reveal that oftentimes, the Mariners’ farm system was a topic of conversation. Jonny Farmelo, currently <a href="https://www.mlb.com/milb/prospects/2026/mariners/jonny-farmelo-806071"

Lazaro Montes is 6-foot-5 and 250 pounds. He used all of it to hit a mammoth home run on Monday, carrying 474 feet into the night, the longest homer at T-Mobile Park in the Statcast era (2015).

What fuels the Mariners’ larger-than-life rookie? Montes has a sweet answer that

This story was excerpted from Daniel Kramer’s Mariners Beat newsletter. To read the full newsletter, click here. And subscribe to get it regularly in your inbox.

SEATTLE -- Lazaro Montes’ sheer power has now been officially felt in the Pacific Northwest.

The 6-foot-5, 250-pound designated hitter demolished Cal Quantrill’s 94 mph fastball into the right-center-field concourse of T-Mobile Park for a three-run blast in the fourth inning of the Mariners' 10-5 loss. It was Montes’

SEATTLE -- With their postseason hopes fleeting, the Mariners made a move on Sunday that signaled towards the future: promoting top hitting prospect Michael Arroyo to the Majors.

Ranked the club’s No. 3 prospect and MLB Pipeline’s No. 45 overall, Arroyo was immediately injected into Seattle’s starting

SEATTLE -- One day after suffering left hip soreness upon crashing into the right-field wall, Lazaro Montes was out of the Mariners’ lineup on Saturday.

But both the rookie and manager Dan Wilson were optimistic about his status and potential availability off the bench.

SEATTLE -- Plenty has been made of the dichotomy between the Mariners’ August schedule -- one of the toughest in MLB -- and their September slate, which sees them play five games against the two teams ahead of them in the division and five series against the three worst teams

This story was excerpted from Daniel Kramer’s Mariners Beat newsletter. To read the full newsletter, click here. And subscribe to get it regularly in your inbox.

Some prospects get a soft landing into pro ball, spending the vast majority of their time with one affiliate in their debut campaign. That hasn’t been the case for Boston Smith, who despite having played for three organizations and four clubs at three different levels, ranks second in

BOSTON -- The Mariners’ celebratory home run trident was wielded regularly on Tuesday night.

And that included a first-time participant who -- by all forecasts, based on what he accomplished in the Minors -- could become a regular.

BOSTON -- Lazaro Montes’ 6-foot-5, 250-pound frame made the confines of Fenway Park’s already small visiting clubhouse feel even more constricted on Tuesday afternoon.

And that was especially so as the Mariners’ 21-year-old power-hitting prospect went through an assembly line of hugs from his new teammates before making his MLB debut

BOSTON -- September roster expansion wasn’t for another day when the Mariners arrived at Fenway Park on Monday, but they were already preparing for slugging prospect Lazaro Montes to join them within the next 24 hours.

Separately, they also added a much-needed -- and welcomed -- return to their

Losers of four straight, the Mariners are in need of some serious firepower to keep from falling too far behind in the AL West and Wild Card races, as they sit five games back in both. They’re about to get some in the form of their No. 5