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Breaking down Seattle Mariners starter, Luis Castillo - Viva El Birdos
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Mariners RHP Luis Castillo agrees to 5-year extension
Bullpen's multi-inning arms set to anchor Mariners pitching staff
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Should the Mariners shuffle the pen?
Seattle Mariners Pitching: Dipoto on Miller, Castillo, prospects
Seattle Mariners 2020 Top 10 MLB Prospects Chat — College Baseball
