Just noticed this in Baseball America's draft database .... Didn't see it mentioned anywhere previously.

Stoneburner is a 2006 grad of Mills Godwin High (AAA, Central Region, Colonial District) who missed his freshman year at Clemson after suffering a leg injury of some sort. He was a draft-eligible, redshirt sophomore. Yankees took him in the 14th round, so he must've negotiated pretty darned well.