"13. Arizona Diamondbacks I admit to liking this system more than most, but I loved their 2009 draft haul and several of those players had strong full-season debuts. Jarrod Parker's promising return in instructional league -- with velocity as good as ever and improved lower-body strength -- is also a factor in putting them in the top half of farm systems, given that he's their one impact prospect who might see the majors this year."