The Mariners’ trade posture is coming into focus at a messy moment.
Seattle is 47-49, riding a five-game losing streak and sitting 1.5 games behind the Texas Rangers in the American League West. The club’s executives are finishing up the MLB Draft on Sunday, but once that’s wrapped, the front office can turn its attention to a trade market that could help steady a shaky stretch.
According to Bob Nightengale of USA Today, Seattle is making it known that it is willing to deal one of its prized starters for a back-end reliever and a right-handed hitter, with Luis Castillo viewed as the most likely candidate. That lines up with the reality of the roster: the Mariners already have a six-man rotation, and they also have Kade Anderson, widely regarded as the finest pitching prospect in baseball, waiting in the wings.
That kind of pitching surplus creates its own problem. Seattle can’t keep everyone in the same lane forever, and the current setup is already crowded enough to be called untenable.
If the Mariners move a starter and later lose one to injury, Anderson is there to step in. And looking ahead to 2027, the logjam only gets bigger.
Castillo, Anderson, Ryan Sloan, Logan Gilbert, Bryan Woo, Bryce Miller, George Kirby, Emerson Hancock and Logan Evans, who is working back from Tommy John surgery, could all need innings.
Castillo is the obvious name to float because of his age, his performance and the money attached to him. He’s 33 and is owed nearly $25 million next season, with a vesting option for 2028.
But the same factors that make him the most logical trade candidate also make him the hardest one to move. Other teams will see the price tag and hesitate.
That means Seattle may have to choose between getting the kind of return it wants and clearing the money off the books. If another club takes on all of Castillo’s contract, the Mariners likely won’t land the players they want. If they want the players, they may have to absorb most or all of the salary just to make a deal happen.
If Castillo isn’t the answer, the conversation shifts to the rest of the rotation. Gilbert is under contract through 2027, and if Seattle does not intend to extend him long term, there’s a case for moving him, even if it would not be popular. That argument becomes even stronger if the Mariners are truly concerned about the schedule being affected in 2027.
And if the club plans to invest in Gilbert, then George Kirby becomes part of the discussion. He’s under contract through 2028, and while moving him would also be unpopular, Seattle cannot keep everybody. Anderson and Sloan are already on the way.
The topic came up on the most recent “Refuse to Lose Territory” podcast with ESPN MLB Insider Buster Olney.
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