Returning to the Mariners’ staff for 2025 are Manny Acta, Tony Arnerich, Trent Blank, Danny Farquhar, Perry Hill, Edgar Martinez, Kristopher Negrón, and Pete Woodworth. Acta transitions to bench coach, while Martinez takes on a new role as senior director of hitting strategy. Negrón moves to third base coach.

"I'm very pleased with the coaching staff we have assembled," said Jerry Dipoto, the Mariners president of baseball operations.

The Seattle Mariners typically promote from within their coaching ranks, but they went outside the organization for two new hitting coaches.