The Mariners are filling out new manager Jason Kanzler’s coaching staff. The team on Monday announced the hiring of Tanner Swanson as its next bench coach and CJ Gillman as its next hitting coach.

Swanson, a Washington state native who graduated from Central Washington University, was on the Yankees’ Major League staff

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.

Sometimes rookies can be seen a mile away and it's clear they will make a big splash once they hit the big leagues full time. Others can sneak up on you, flying under the radar until they're given the opportunity to show what they can do.

A year ago, we picked

The Silver Slugger Award is presented to the best hitter at each position in each league annually, and it is voted on by MLB managers and coaches (who are not allowed to vote for players on their own teams). The coveted honor was established in 1980, with new

SCOTTSDALE, Ariz. -- The 20th annual Fall Stars Game is in the books and it was a tightly contested showdown indicative of the considerable talent on both the American League and National League rosters.

It was an eighth-inning breakout from the NL squad that firmly swung the pendulum its way en

SEATTLE -- Until donning a Mariners No. 18 jersey for the first time on Wednesday, Jason Kanzler was largely an enigma to baseball fans in the Pacific Northwest.

Who was this 36-year-old who, outside the deeper corners of the industry, few knew about?

What did the Mariners see in him that they

This page will be updated throughout the offseason to reflect the team’s latest transactions and any injury updates.

SEATTLE -- Jason Kanzler has already met with the Major League coaching staff that the Mariners are retaining in 2027.

After all, they were part of his in-person interviews last week as he emerged as a finalist for the club’s managerial vacancy. And now that he’s been selected as Seattle’s

SEATTLE -- The Mariners have found their new manager, and it’s an outside-the-box, under-the-radar hire who will become a first-time skipper at any level.

Jason Kanzler -- a 36-year-old emerging talent in the industry, who’s spent the past three seasons as the Cubs’ director of player development -- has been hired

The calendar may have flipped to November, but you can still watch live baseball featuring many of baseball's top up-and-coming players.

The 34th annual Arizona Fall League season enters its home stretch as it gears for playoffs, and you can watch top prospects from all 30 MLB organizations throughout November as

SEATTLE -- As Randy Arozarena eyes the possibility of a big payday in free agency, the Mariners have set themselves up with the chance to receive Draft pick compensation should he sign with another team.

Arozarena was one of eight free agents across MLB who received a <a

The Arizona Fall League created a Fall Stars Game in 2006 to highlight the most talented players in a circuit full of top prospects. The first 19 contests spotlighted several future big league notables such as Ronald Acuña Jr., Pete Alonso, Mookie Betts, Bryce Harper, Aaron Judge, Francisco Lindor, Andrew

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.

In last year’s Arizona Fall League Fall Stars Game, Kevin McGonigle led off for the American League, Hagen Smith struck out a pair in a scoreless inning of relief and Sam Antonacci picked up two RBIs, including the game-winner on a walk-off sacrifice fly in the ninth inning

Konnor Griffin and Kevin McGonigle entered the 2026 season ranked as baseball's two best prospects, in that order, on MLB Pipeline's Top 100.

Griffin made his big league debut in April at age 19 and starred in May before a pair of injuries sidelined him for most of the next three

SEATTLE -- As the Mariners press through the decision-making phase of hiring their new manager, they have already landed the hitting coach that will join the selected candidate’s Major League staff.

CJ Gillman, who was Seattle’s Minor League hitting coordinator from 2022-25, will take over as the club’s Major

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

SEATTLE -- The Mariners began their offseason in earnest on Thursday immediately after the World Series ended, announcing decisions for club options they held on three players.

• Andrés Muñoz: $9 million, exercised
• Bryce Miller: $6.075 million, declined (but still under club control through 2029)

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 -- 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.

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

After playing 10 seasons in the Major Leagues, Mitch Garver has retired, Garver told MLB.com’s Daniel Kramer via text message on Thursday.

Garver, 35, has called it a career with a World Series ring and a Silver Slugger Award under his belt. The catcher and designated hitter was a key contributor to