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Mariners reveal updated plan for starting pitching rotation
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They've got the elite arms': Mariners keep improving pitching with each MLB draft
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Isaiah Campbell Promoted to Travelers
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Mariners Notebook: Seattle adds 4 prospects to 40-man roster - Seattle Sports
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Key prospects dot Travs' roster in '23
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Isaiah Campbell - MLB News, Rumors, & Updates
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Isaiah Campbell Stats, Fantasy & News
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Checking in with Mariners Prospect Isaiah Campbell, by Mariners PR
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Seattle Mariners Top 32 Prospects