Seattle Mariners Explore Trade of Pitcher Luis Castillo Before Deadline

The Seattle Mariners are actively looking to move veteran right‑hander Luis Castillo, their most expensive and oldest starter, before the August 3 trade deadline. Castillo carries a $32.5 million salary through next season and a $25 million vesting option for 2028, while posting a 4.93 ERA and 1.37 WHIP this year. The club is also considering right‑hander Emerson Hancock as an alternative piece.

Seattle hopes to receive a right‑handed hitter and a high‑leverage reliever, and is prepared to absorb part of Castillo’s salary to facilitate a deal. The organization cites the need to balance its lineup, especially against left‑handed pitching, as it competes for an AL West spot and a Wild Card berth.

Prospect Kade Anderson, a Double‑A Arkansas pitcher with a 9‑1 record and a 1.27 ERA, is mentioned as a potential replacement to bridge the rotation after a Castillo trade, giving the Mariners flexibility to improve offensively without sacrificing long‑term depth.