A good check on the strength of an organization is Baseball America's annual League Top-20 Prospects series that runs at the end of each season. They just wrapped up this year's list and Seattle again had a strong showing, landing 12 different players in 13 spots on the lists, tying with St. Louis, division rival Houston, Toronto and Arizona's systems for the 8th highest total in either league.
Here is a breakdown by league for those 12 players with the ranking in their respective league's Top-20 in parentheses.
Appalachian LeagueEdwin Diaz (9)
Wilton Martinez (13)
Northwest LeagueD.J. Peterson (3)
Austin Wilson (5)
Jack Reinheimer (14)
Lars Huijer (18)
California LeaguePatrick Kivlehan (7)
Chris Taylor (11)
Southern LeagueTaijuan Walker (4)
Brad Miller (13)
Julio Morban (17)
Pacific Coast LeagueTaijuan Walker (6)
Nick Franklin (9)
It is worth noting that three of those players debuted in Seattle this season, with Franklin and Miller actually playing enough to exhaust their rookie status while securing starting spots and Walker showing enough that the 21-year-old is very likely looking at a spot in the 2014 Opening Day starting rotation for the Mariners.
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