Castro has put together a .241/.304/.295 slash line with a home run and 11 RBI over 45 games this season for Triple-A Oklahoma City. He last surfaced in the big leagues during the 2018 campaign, though his stay lasted just 18 contests. He figures to be assigned to Triple-A Tacoma following Sunday's transaction and will serve as organizational depth.
Mariners' Daniel Castro: Dealt to Seattle
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