This week we continue our annual review of the top prospects in baseball by position, this time with top 3B prospects. On the surface, there doesn't appear to be any prospect assured of significant playing time in 2012. There aren't many openings at present, though a few prospects could take advantage of minor injuries or the lack of depth. The lack of major league-ready 3B shouldn't be any indication, however, of the quality of prospects at that position.