Farm systems rising and falling in 2012
With more than half of the minor league season in the books and the signing deadline for drafted players also behind us, the relative positions of most teams' farm systems have changed significantly compared to where I ranked them back in February. I'll do another full ranking in the offseason, but in the meantime, here's a look at the three most improved systems since the last rankings and at the three systems that have suffered the most.
Houston Astros (preseason ranking: 27)
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