Watch Mariners prospects in Arizona Fall League action
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Source-linked injury notes, trades, roster moves, lineup updates, and video references, rewritten as Posterior briefs and tied back to the original publisher.
Here's one stat from each farm system that caught our eye in 2026
Mariners club coverage from the official MLB.com wire.
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Young's defense recognized with Gold Glove nomination
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Mariners Land Boston Smith, Domínguez, Jones in Luis Castillo Deal
Seattle sent ace Luis Castillo to Chicago and received three players including catching prospect Boston Smith at the summer trade deadline.
Mariners Seek Interview With Astros' Espada for Manager Role
Seattle has received permission to meet with Houston's Joe Espada, whose contract expires at month's end and whose future with the Astros is uncertain.
Espada Interviews for Mariners Manager Job
Former Astros manager Joe Espada is in the mix to fill Seattle's managerial vacancy, according to a sourced report.
Joe Espada to interview for Mariners manager vacancy, per report
Astros manager Joe Espada is being considered for Seattle's managerial opening, per MLB.com. No hire has been announced.
Seattle Mariners offseason outlook: money to spend, pitching to move, 76-86 to answer for
After finishing 76-86 and well short of expectations, the Mariners head into 2027 with a defined core and several roster decisions still unresolved, per MLB Trade Rumors.
Checking in on Seattle's farm system standouts heading into the offseason
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After 2 trades and a breakout '26, Mariners prospect Smith leads Seattle's AFL crop
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Here are each organization's Prospects of the Year
Mariners club coverage from the official MLB.com wire.
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Naylor takes responsibility for rough results during season plagued by injuries
Mariners club coverage from the official MLB.com wire.
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Raleigh, Naylor both undergo offseason surgeries for Seattle
Cal Raleigh had left shoulder surgery and Josh Naylor had right wrist surgery this offseason; both are expected to be fully recovered by Spring Training, per MLB.com.
Mariners announce surgeries for Cal Raleigh and Josh Naylor
The Mariners announced Oct. 3 surgeries for Cal Raleigh (left shoulder) and Josh Naylor (right wrist); both are expected to recover before spring training 2027.
Mariners continue managerial search as key offseason questions take shape for 2027
Seattle is searching for a new manager heading into the offseason, per MLB.com's Daniel Kramer, with organizational direction for 2027 still taking shape after a 76-86 season.
Here is each club's Arizona Fall League sleeper prospect
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Mariners Claim Michael Toglia Off Waivers from Reds
Seattle adds the switch-hitting first baseman/outfielder, who missed most of 2026 recovering from shoulder surgery.
Mariners claim Michael Toglia off waivers, place him on 60-day IL
Seattle claimed first baseman Michael Toglia from Cincinnati, per a club announcement; Toglia is recovering from season-ending shoulder surgery, with spring availability uncertain.
The final Top 100 Prospects list of the year has a new look
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Jerry Dipoto takes accountability for Mariners shakeup, launches managerial search
Mariners GM Jerry Dipoto publicly owned the decision to dismiss manager Dan Wilson and announced a search for new managerial leadership for 2027.
Mariners Seek Experienced Manager, Lovullo Leads Candidate List
After dismissing Dan Wilson following a disappointing 76-86 campaign, Seattle is prioritizing a proven big-league skipper for a culture reset.
Kade Anderson earns Pitching Prospect of the Year honors for Seattle
The Mariners pitching prospect capped an impressive season by winning the organization's top pitching prospect award for 2026.
Mariners part ways with bench coach Acta and hitting coach Seitzer
Seattle is overhauling its coaching staff heading into 2026, with at least two prominent names confirmed not returning.
Mariners dismiss four coaches as Seattle overhauls staff ahead of 2027
The Mariners announced the departures of bench coach Manny Acta, infield coach Perry Hill, hitting coach Kevin Seitzer, and first base coach Eric Young Jr.
Mariners Part Ways With Manager Dan Wilson After 2026 Season
Seattle confirmed Wilson's departure following a disappointing 2026 campaign, with GM Jerry Dipoto citing a need for new direction heading into 2027.
Dan Wilson won't return as Mariners manager after 2026 season
MLB.com reported Dan Wilson will not be back as Seattle's manager in 2027, ending his tenure with the Mariners.
Dan Wilson's tenure as Mariners manager ending after 2026
Sources indicate Dan Wilson will not be brought back to manage Seattle beyond the current contract, signaling a managerial change is coming.
Kade Anderson exits after taking 103.8 mph liner off pitching forearm
The Mariners pitcher was hit by a hard line drive on his pitching arm and did not continue, raising concern about his availability.