Seattle Mariners Executive Vice President & General Manager of Baseball Operations Justin Hollander announced today the Mariners 2026 Opening Day roster. The Mariners open the 2026 season at T-Mobile Park tomorrow night against the Cleveland Guardians.

Will it be a trident-up or trident-down season for the Mariners? Here's a look at what to expect, including best- and worst-case scenarios for each player.

During the opening homestand, that means Thursday, March 26 against Cleveland will air on Mariners TV, Friday, March 27 will be exclusive to Apple TV, Sunday, March 29 will be exclusive to Peacock, and the other games in that opening stretch will air on Mariners TV.

The Mariners entered Spring Training with one of their most complete rosters in recent memory, without many question marks and no real voids. So, perhaps it’s fitting that the club unveiled its 26-man contingent for Opening Day one day early.

Opening Day at T-Mobile Park features the Mariners debut of Donovan as leadoff hitter, bringing discipline and consistency to the lineup.

The Seattle Mariners picked their backup catcher, and it wasn't the one they gave a major league contract over the winter.

The Seattle Mariners have announced the team’s 2026 opening day roster. The team opens the season at T-Mobile Park tomorrow night against the Cleveland Guardians. First pitch is set for 7:10 p.m. Right-hander Logan Gilbert is slated to make his second consecutive and second career opening day start.

The Seattle Mariners seem likely to put out a lineup this season that isn't anything like what old-school baseball minds would've done. But this is 2026, and so Brendan Donovan, Cal Raleigh and Julio Rodriguez all find themselves in new-age spots in the lineup.