Overview
- Multiple outlets on Thursday, citing The Athletic, identified Luis Castillo as the most likely Mariners starter to be moved before the Aug. 3 trade deadline.
- Seattle’s unusually deep rotation and rising prospects such as Kade Anderson and Ryan Sloan have created the roster flexibility to consider trading a veteran starter.
- The Mariners are said to prioritize at least one high‑leverage reliever and a right‑handed hitter in any package for Castillo, which narrows the set of acceptable trade partners.
- Castillo’s recent turnaround — a 3.25 ERA in roughly 44 innings since mid‑May — has boosted interest, but his remaining roughly $25 million over two seasons and a second‑year vesting option tied to innings are major obstacles.
- If a deal happens, contenders that need controlled veteran pitching could trade bats or relievers in response, and seller clubs such as the New York Mets have been floated as plausible partners who could meet Seattle’s needs.