Kazmir used to be a Met too, was traded for Victor Zambrano. The Mets are notorious for blowing up the farmsystem with worthless trades.
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Besides the Kazmir trade, which was made by an interim GM who lost his job after 2 months, and the Bay trade in 2002, (the Mets, along with the Expos and Padres, traded Bay before he was seen as a top prospect) is there another instance of a traded Mets prospect making it big? No.
Carlos Gomez? Solid player, but traded for Johan Santana. Mets Win.
Lastings Milledge? No.