The Mariners are adding Mitch Garver to their Opening Day roster as their backup catcher, according to a report from Ryan Divish of the Seattle Times. That seemingly leaves catcher Andrew Knizner without a spot on the club’s roster headed into the season.

The Seattle Mariners announced their lineup and probable pitchers for Friday's Spring Breakout prospect showcase against the Milwaukee Brewers.

This one was always going to sting a little, even if it was easy enough to see coming. The Mariners officially reassigned Colt Emerson to minor league camp, and

After much success in its first two years, Spring Breakout is back in 2026, creating a showcase-type opportunity for the best and brightest faces of the future by pitting them against other prominent prospects from other organizations.

The Seattle Mariners' talent-laden farm system will be on full display as part of MLB's annual Spring Breakout showcase of the league's top prospects.

The Mariners earned one of the boldest predictions of the spring, and it reflects just how complete Seattle looks in 2026.

Cal Raleigh’s bases-clearing double capped a six-run seventh inning for the Mariners in their 6-4 Cactus League win over the A’s.

With opening day approaching, shortstop has become a question mark for the Seattle Mariners as J.P. Crawford has dealt with a shoulder injury throughout spring training. Callis: Mariners have MLB’s best pitching prospect duo There was an interesting wrinkle to the team’s lineup on Friday against the Guardians that may be a preview of what the plan will be if Crawford needs to start the season on the injured list.