Baseball America's Jim Callis rates the systems:
1. Cardinals - Loaded big league club awaits Oscar Taveras, Shelby Miller and Trevor Rosenthal.
2. Mariners - Their best prospects, even 2012 first-rounder Mike Zunino, have had Double-A success.
3. Marlins - Blockbuster trade with Blue Jays propelled this system from middle of the pack.
4. Rangers - No organization has more high-ceiling prospects, or one better than Jurickson Profar.
5. Red Sox - Help is on the way with Xander Bogaerts, Jackie Bradley, Matt Barnes and Allen Webster.
6. Rays - Dealing for Wil Myers and Jake Odorizzi helps to make up for recent lackluster drafts.
7. Twins - The best collection of bats in the minors, led by Byron Buxton and Miguel Sano.
8. Pirates - System isn't deep but has impressive trios of arms and bats that most can't match.
9. Diamondbacks - No. 6 on my list before subtracting Trevor Bauer and adding Didi Gregorius.
10. Astros - Rebuilding will take time, but trades and 2012 draft are steps in the right direction.