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.

Find out how to watch the Mariners on Opening Day and all season long, including streaming options, cable updates, and Mariners.TV details.

Seattle’s loss to Cleveland wasted a strong power display from Canzone, Raley, and Donovan while exposing the same offensive concerns.

The Seattle Mariners kicked off their season on Thursday against the Cleveland Guardians. Here are some scenes from inside T-Mobile Park:

Mariners baseball is back in Seattle as opening day kicks off with a 7:10 p.m. first pitch against the Cleveland Guardians at T-Mobile Park.

Opening day for the Mariners at T-Mobile Park meant a big showing for businesses in the Stadium District.

Every year, on opening day, the Seattle Mariners invite a wish kid to run the bases. It’s a longstanding and beloved tradition between the Seattle Mariners and Make-A-Wish Alaska and Washington. This year’s base runner is 11-year-old Brody from Onalaska,

The Seattle Mariners designated hitter began 2026 on a high note with a multi-home run performance against the Cleveland Guardians