Mets Deny Sheffield's Request For Extension

8:48: SI's Jon Heyman reports, via Twitter , that the Giants were the team that claimed Sheffield on waivers earlier this month. 6:23pm: David Lennon at Newsday reminds us that earlier this month, the Mets placed Sheff on waivers, but pulled him back when he was claimed. This means he cannot be traded; the Mets could release him or place him on irrevocable waivers and lose him if he is claimed. 5:57pm: Via Twitter , Sherman cites a Mets official who says that "Sheffield has not been

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