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Apparently Servais sees him as "a major league player right now" and Grube himself was advised that he was merely here in order to provide coverage against the previous day's 15-inning marathon. Thus goeth the modern I-90 roster extension.
http://m.mariners.mlb.com/news/article/194780262/guillermo-heredia-optio...
Don't think it was needed to hold Edwin Diaz out of yesterday's game, at least not in theory, but now he gets 2 full days off and is back to virtual ground zero. :: happy dance ::