The Move
Jackson, 30, was claimed off waivers from the A’s during the offseason and was expected to compete for a middle-relief role in Seattle’s bullpen. Despite showing flashes of the strikeout-heavy potential he displayed in Oakland, Jackson never found consistent footing with the Mariners.
Through 18 appearances this season, Jackson posted a 5.47 ERA with a 1.63 WHIP and 14 walks in 24.2 innings — numbers that ultimately prompted the Mariners to make a change.
“Zach’s a talented arm, but we need reliability right now,” Mariners manager Scott Servais said in a press briefing. “We have to put our best foot forward every night in a division that’s extremely competitive.”
Bullpen Woes and Roster Pressure
Seattle’s bullpen has been under fire in recent weeks, with multiple blown leads and late-inning collapses. Injuries to key arms like Andrés Muñoz and inconsistent performances from depth pieces have forced the front office to reassess its roster depth earlier than anticipated.
The DFA of Jackson opens up a spot on the 40-man roster, which could be used to promote a high-performing arm from Triple-A Tacoma — likely Ty Buttrey or Sam Carlson, both of whom have impressed in recent weeks.
What’s Next for Jackson?
With prior MLB experience and flashes of upside, Jackson could draw interest on the waiver wire from clubs seeking bullpen reinforcements. If he clears waivers, the Mariners could attempt to outright him to Tacoma — though a mutual parting is more likely.
Final Thoughts
While Jackson’s time in Seattle may have been short-lived, the move signals that the Mariners are in win-now mode, unwilling to carry underperforming arms in a crowded AL West race.