The signing deadline for this year's drafted players has passed, with few surprises. Only one player (Tampa Bay Rays pick Drew Rasmussen of Oregon State) drafted on Day 1 failed to sign, and I've already reordered the top 50 prospects in the minors earlier in the month.

We've also seen a few major trades involving top prospects as the White Sox and A's continue their rebuilding efforts.

Here now is a very temporary ranking of the five strongest farm systems in baseball, subject to change even in the next week as we approach the trade deadline.

1. Atlanta Braves

Top 50 prospects: Ronald Acuna (9), Kolby Allard (26), Ozhaino Albies (32), Kyle Wright (35), Luiz Gohara (39), Ian Anderson (41), Mike Soroka (49)

I still have Atlanta at the top, because they have more depth of players who project to be average big leaguers or better in their system than any other organization -- and, by and large, their prospects have met or exceeded expectations this year.