Sunday, August 16, 2026 — Seattle’s roster problem is the easiest one in baseball to describe and the hardest to fix.
The Mariners have too much pitching and not enough hitting. They have known this for two years. At the deadline they finally started acting on it — and the offseason is where the real work happens.
What They Did in July
Seattle moved Luis Castillo to the White Sox, receiving reliever Seranthony Domínguez, outfielder Nolan Jones and catching prospect Boston Smith. That was the salary decision: Castillo was owed roughly $30 million through next season and was in the middle of the worst year of his career.
The more interesting development was what didn’t happen. Ken Rosenthal and Will Sammon reported in late July that Seattle was telling clubs it would listen on Emerson Hancock — a 27-year-old with a 3.16 ERA and a 1.01 WHIP over 19 starts who isn’t arbitration-eligible until 2028 and is controlled through 2030.
Nobody met the price. That conversation restarts in November.
The Surplus Is Real
Count the arms. Logan Gilbert, Bryan Woo, George Kirby and Bryce Miller are all established major league starters. Behind them sit Kade Anderson and Ryan Sloan, two of the three best pitching prospects in the sport by most rankings. Hancock has pitched his way into that group.
That is seven starters for five spots, and two of them are prospects who need innings.
Meanwhile the offense finished the deadline period ranked 29th in the majors in runs scored and tied for 27th in OPS. Cal Raleigh and Randy Arozarena carry it; almost nothing else does.
Two Names to Watch
Emerson Hancock. The cheapest, most controllable piece — and therefore the most valuable to acquiring teams and the most painful to give up. Five years of a mid-rotation starter near the league minimum is precisely what every front office is hunting, especially with a possible salary cap changing how clubs value cost certainty. The Cubs were the natural fit in July and remain one.
George Kirby. The bigger name and, in some ways, the more logical trade. Kirby is further along his arbitration path, which means he’s more expensive and closer to free agency — the classic profile Seattle should be converting into bats before the value erodes. CBS Sports listed both Kirby and Hancock among its early offseason trade candidates.
What They Want Back
Controllable offense, and specifically right-handed offense with position flexibility. Adam Jude of the Seattle Times reported interest in Cincinnati’s Spencer Steer, who has played six positions this season and is controlled through 2028. That deal never materialized — Steer sprained his wrist in late July and landed on the injured list — but the profile is instructive.
Seattle isn’t looking for a rental slugger. It’s looking for multiple years of an average-or-better bat it can pay reasonably, because the payroll is already committed to arms.
The Complication Nobody Can Plan Around
The CBA expires December 1, and a lockout is widely expected immediately after. Trades cannot be completed during a lockout, which compresses the entire offseason into a window that may close before the Winter Meetings would normally happen.
That has two effects on Seattle specifically. It creates urgency to move quickly in November, before the shutdown. And it makes cheap, controllable pitching — exactly what the Mariners are selling — more attractive than ever, because a starter earning near the minimum is cap-proof in a way a $25 million veteran is not.
The Bottom Line
Seattle has the most tradeable inventory in baseball and the clearest need to use it. Jerry Dipoto has never been shy about making moves, and the surplus is now so pronounced that standing pat would mean leaving one of the best pitching prospects in the sport in Triple-A for another year.
Expect the Mariners to be one of the busiest teams of the winter — and expect at least one of Kirby or Hancock to be pitching somewhere else next April.
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