The Seattle Mariners are expected to make significant changes to their bullpen by Opening Day on March 27. Key players like Gregory Santos are returning from injuries, while Matt Brash is projected to rejoin the team by July after Tommy John Surgery.

Five relievers are up for arbitration, including Austin Voth, whose future with the Mariners remains uncertain despite solid advanced pitching metrics. Voth's performance in high-pressure situations has been notable, but his inconsistency could lead to a non-tender decision.