When Daniel Nava smacked the first pitch of his major-league career into the Red Sox bullpen for a grand slam on June 12, it must have sent shivers through the likes of George Sherrill, Rod Barajas, and Heath Bell. For it was yet another in an increasing line of undrafted success stories in Major League Baseball.

Just ask the San Diego Padres. Their successful 2010 campaign has been spearheaded by "The Pen-itentiary", with fellow undrafted pitcher Mike Adams paving the way for Bell in the back...
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