The Seattle Mariners claimed veteran left-hander Jose Castillo off waivers from the New York Mets on Wednesday.
In a corresponding move to open a spot on the 40-man roster, the Mariners designated left-hander Joe Jacques, a minor leaguer, for assignment.
Castillo, 29, last pitched on Friday, allowing one run on four hits with two strikeouts and no walks in two innings of a 19-9 home win over the Miami Marlins. He was designated for assignment on Saturday.
He was a combined 1-2 with a 4.98 ERA, nine walks and 22 strikeouts in 21 2/3 innings over 21 relief appearances this season for the Arizona Diamondbacks and Mets.
Castillo, who missed the entire 2021 season after undergoing Tommy John surgery, is a career 4-5 with a 4.50 ERA, 25 walks and 77 strikeouts in 62 innings for the San Diego Padres (2018-19, 2022-23), Diamondbacks (2025) and Mets (2025).
Jacques, 30, was acquired by the Mariners from the Los Angeles Dodgers on June 2 for right-hander Will Klein. He has pitched this season for the Dodgers’ and Mariners’ Triple-A affiliates, going a combined 2-1 with three saves, a 6.51 ERA, 22 walks and 53 strikeouts in 47 innings over 42 games (one start).
His major league career spans parts of two seasons with the Boston Red Sox (2023-24) and Diamondbacks (2024). He is 2-1 with one save, a 5.46 ERA, 11 walks and 22 strikeouts in 29 2/3 innings over 25 games (one start).
