From ESPN.com -
The Yankees have long had the game’s biggest payroll, but their farm system has lain fallow for several years, the result of some uninspired draft picks and trades that rid the system of the few prospects who remained. Over the last 18 months, however, the Yanks’ system has made a stunning turnaround, going from one of the five worst systems in the game to one of the 10 best.
What sets the Yankees’ system apart from most others is the presence of two of the 10 best prospects in baseball, something no other organization can claim.
It’s a significant improvement for such a short period of time, and it’s very bad news for the other four teams in the AL East.