The Mariners announced that they have claimed left-hander José Castillo off waivers from the Mets. The latter club designated him for assignment a few days ago. To open a 40-man roster spot, fellow lefty Joe Jacques has been designated for assignment. Castillo is out of options, so the M’s will need to make a corresponding active roster move once he reports to the team. Ryan Divish of The Seattle Times reported the claim prior to the official announcement.
Castillo, 29, has logged 21 2/3 innings this year between the Diamondbacks and Mets. He has allowed 4.98 earned runs per nine but with better underlying metrics. His 21% strikeout rate and 8.6% walk rate are both close to average, while his 52.9% ground ball rate is quite strong.
That performance hasn’t been enough to keep him in the majors for an extended stretch. Since he is out of options, he has been designated for assignment multiple times this year. Arizona gave him his first DFA of the season in May and then flipped him to the Mets for cash. Since then, the Mets have given him the DFA treatment three times. The first two resulted in him clearing waivers and sticking with the Mets, later getting selected back to the roster. Around the transactions, he also tossed 16 Triple-A innings with a 1.69 ERA, 35.9% strikeout rate, 9.4% walk rate and 50% ground ball rate.
On this third Mets DFA, the Mariners have swooped in to grab him. They already have three lefties in their bullpen, with Gabe Speier, Caleb Ferguson and Tayler Saucedo back there, but adding Castillo will give them even more balance in their relief corps. He has between four and five years of big league service time, so they can retain him for 2026 via arbitration if he still has a roster spot at season’s end.
More to come.
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