The Mariners optioned Castano to Triple-A Tacoma on Friday, per team reports.

Fantasy Impact

Castano, 26, joined the 40-man roster in November but struggled this spring—five runs (four earned) in two innings—after a 5.13 ERA and 1.41 WHIP with Tacoma in 2024. He’ll need sharper numbers for a Seattle rotation shot. Fantasy managers in dynasty leagues can watch this righty; he’s a step away for now.