PEORIA, Ariz. -- His ‘A’ hacks were among the loudest of the afternoon.

As they echoed on a Peoria Sports Complex back field on Wednesday, each boom audibly showed why the Mariners believe Colt Emerson is knocking on the Major League door.

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 -- Jurrangelo Cijntje remains an ambidextrous wonder, and he will continue to explore avenues to pitch with both arms as he climbs up the Mariners’ farm system.

But Cijntje will be exclusively focused on pitching right-handed when he reports to his first big league Spring Training on Feb. 11.

SEATTLE -- When MLB Pipeline unveiled its Top 100 Prospects entering the 2026 season last week, the Mariners paced the sport with seven among that group.

And each of them will be in big league camp when the Mariners begin Spring Training <a

Welcome to Funko Field, where Webbly keeps the place hoppin', the front office isn't afraid to get a little bit trippy and the AquaSox faithful prize their affiliation with the Mariners.

Welcome to CHI St. Vincent Field at Dickey-Stephens Park, a 21st-century stadium where the echoes of baseball history are palpable, a swamp possum runs amok and the fans root on Mariners prospects in the Double-A Texas League.

Once again, the Mariners can boast the deepest group of top-end Minor League talent in baseball.

With the release of MLB Pipeline’s 2026 preseason Top 100 Prospects list, Seattle paces all clubs with seven ranked players. Including preseason and midseason lists, this is the fourth straight cycle in which no team

An absolutely stacked Mariners farm system is getting even better.

Seattle has opened the 2026 international signing period by landing three of MLB Pipeline’s Top 50 international prospects, including outfielders Juan Rijo (No. 12) and Gregory Pio (No. 32), and shortstop Leonardo Reynoso (No. 48).

SEATTLE -- The Mariners’ blueprint of this era has been with a "Draft and develop" mantra, but this ethos goes back way further.

Here is a subjective ranking of the 10 most-anticipated prospects to make their debut with Seattle.

The new year is all about resolutions -- and, yes, predictions!

Nobody knows what the future holds, but on the latest MLB Pipeline Podcast, Jim Callis and Jonathan Mayo do their best to try figuring it out. Callis and Mayo whip out their crystal balls to project which prospects

SEATTLE -- Colt Emerson’s rapid rise through the Minor League ranks was the most eye-opening aspect to his 2025 season. But it was the makeup that he exhibited upon being invited to Seattle’s postseason taxi squad that stood out even more among the club’s front office.

Emerson, all of

SEATTLE -- The Mariners have landed their coveted lefty reliever, but in doing so, they are also parting with their top catching prospect and now must address what to do at Cal Raleigh’s backup spot.

Seattle is sending Harry Ford, their first-round pick in the 2021 MLB Draft and MLB Pipeline's

Both in search of an upgrade, the Mariners and Nationals struck a deal on Saturday, sending left-handed reliever Jose A. Ferrer to Seattle in exchange for MLB Pipeline’s No. 42 prospect, catcher Harry Ford (who becomes their No. 2 prospect), and Minor League right-hander Isaac Lyon.

Welcome to John Thurman Field, where the Modesto Nuts keep the parent-club Mariners rooted in the mainland, the fans celebrate their agricultural roots and mascots Al, Wally and Shelly never get too salty.

The Winter Meetings begin Monday in Orlando, Fla., and prospects are certain to be on the shopping list for some clubs.

Which team will get the best holiday-season deal? Who has the prospect capital to make that kind of deal happen?

PEORIA, Ariz. – When Tyler Cleveland started his college career at Central Arkansas in the pandemic-shortened 2020 season, he was very much a generic right-handed reliever, coming at hitters with a standard delivery and a fastball that sat around 85-86 mph to go along with a pedestrian breaking

SCOTTSDALE, Ariz. -- Jonny Farmelo is getting there, even if it’s not quite where he really wants to be.

MLB's No. 75 prospect (SEA No. 7) came to the Arizona Fall League eager to make up for time he’s lost due to injury. The No.

The two biggest challenges for Mariners outfield prospect Jonny Farmelo during his time playing in the Arizona Fall League are being healthy on the field and finding a TV when he’s off of it.

Health has been elusive for the Mariners’ No. 7 prospect (No. 75 on

The 33rd season of the Arizona Fall League is a week old, and already, there are top prospects standing out amid the field of, well, top prospects.

Here are the top performers from the first week of AFL action: