Mariners unveil 2026 opening day roster and who’s on IL

We know now who will be suiting up for the Seattle Mariners on opening day at T-Mobile Park.

The Mariners revealed their 26-man roster on Wednesday, which didn’t feature any surprises.

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Seattle’s opening day roster will include 13 pitchers and 13 position players. The group has 22 returnees from the 2025 squad and four newcomers. Two of Seattle’s pitchers are left-handed and 11 are righties. The group of position players features five left-handed bats, seven right-handed bats and one switch-hitter.

The four newcomers on Seattle’s roster are right-hander Cooper Criswell, left-hander José A. Ferrer, third baseman Brendan Donovan and outfielder/designated hitter Rob Refsndyer.

In addition to the release of the opening day roster, the Mariners placed shortstop J.P. Crawford (right shoulder inflammation) and utilityman Miles Mastrobuoni (right calf strain) on the 10-day injured list, and right-hander Bryce Miller (left oblique strain) on the 15-day IL. All three players’ IL designations are retroactive to March 22. Catcher Andrew Knizner also cleared waivers and elected free agency. 

The Mariners open the season 7:10 p.m. Thursday at T-Mobile Park against the Cleveland Guardians. Right-hander Logan Gilbert will get the opening day start for Seattle opposite Guardians right-hander Tanner Bibee. Radio coverage can be heard on Seattle Sports 710 AM and the Seattle Sports app starting with the pregame show at 6 p.m.

Here’s a full look at the Mariners’ 26-man roster for opening day.

Hot off the press! #TridentsUp pic.twitter.com/P9hHeHXDez

— Seattle Mariners (@Mariners) March 25, 2026

Pitcher

• Eduard Bazardo
• Matt Brash
• Luis Castillo
• Cooper Criswell
• José A. Ferrer (L)
• Logan Gilbert
• Emerson Hancock
• George Kirby
• Casey Legumina
• Andrés Muñoz
• Gabe Speier (L)
• Carlos Vargas
• Bryan Woo

Catcher

• Mitch Garver
• Cal Raleigh

Infield

• Ryan Bliss
• Josh Naylor (L)
• Leo Rivas (S)
• Cole Young (L)

Outfield

• Randy Arozarena
• Dominic Canzone (L)
• Victor Robles
• Julio Rodríguez

Infield/outfield

• Brendan Donovan (L)
• Luke Raley (L)
• Rob Refsnyder

More on the Seattle Mariners

• Mariners to go with Mitch Garver as backup catcher
• Randy says he apologized, Cal says WBC drama ‘in the past’
• Gilbert’s final spring start features surprises from Raleigh
• MLB Pipeline’s Callis: Mariners have MLB’s best pitching prospect duo
• Drayer: The state of the Mariners as camp breaks for opening day

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