The Seattle Mariners have made their first significant offseason move by acquiring first baseman Austin Shenton from the Tampa Bay Rays for cash considerations. Shenton, previously drafted by the Mariners in 2019, had been traded to the Rays in 2021 as part of a deal that brought Diego Castillo to Seattle.

In a related move, the Mariners designated reliever JT Chargois for assignment to clear space for Shenton on the 40-man roster. Chargois had a solid 2024 season but is now likely to be non-tendered, suggesting the Mariners may seek to re-sign him at a lower cost or he could find a new opportunity elsewhere.