Matt Pierpont, who had been with the Mariners for the last four years as a minor league pitching coordinator, is moving onto St. Louis for a more prominent position.

The announcement was made by Mariners President of Baseball Operations Jerry Dipoto, Executive Vice President & General Manager Justin Hollander, and Manager Dan Wilson. Returning to the Mariners’ staff for 2025 are Manny Acta,

The Seattle Mariners announced their full 2025 coaching staff on Tuesday, less than 24 hours after Daniel Kramer of MLB.com reported that their crew would include a pair of new hitting coaches to assist in their efforts to rejuvenate their offense.

Carson Vitale, who has been with the Mariners since the COVID 2020 season, is leaving the organization to join the Miami Marlins.