To kick off my look this week at the best prospects in the minor leagues, I've ranked all 30 MLB farm systems from top to bottom, considering only the players who are currently in the systems and have not yet exhausted their rookie year of eligibility. (I use the same criterion for the individual player rankings that will be posted over the next few days.)
There's a real concentration of talent among the top few farm systems, teams that have been bad in recent years and stockpiled prospects, plus a couple of clubs that have wielded their financial might to bolster their farms.