Jackson got off to a torrid start then was sidelined by a strained ligament in his pinkie and hasn't been the same since returning. In 9 games back from injury he is hitting .143 with 11 strikeouts and 2 HR. He has hit in 5 of his last 6 games so it's just a matter of time before he has a few multi-hit games and brings that AVG back up.
Matthew Moore - Rays SP DOB: 06/18/89 2.78 ERA, 64.2 IP, 87/19 K/BB, .204 AVG
If Moore were with another organization he may already be in the majors. The Rays plethora of pitching has allowed them to take their time with him and when he is called up he should contribute in fantasy immediately and could strikeout more than a batter an inning in the majors.
Parker is starting to look like the top prospect he was before Tommy John Surgery derailed his march to the majors. In his past 10 innings he has allowed only 5 hits with no walks and 12 strikeouts. If he continues to pitch the way he has recently I would expect him to be promoted to AAA before the year is done and we may even see him in a Diamondbacks uniform come September.
Delgado has been very good for the most part this season. Take away his two worst starts and his ERA would be 1.86. Yes, those starts happened but this demonstrates how dominating he can be. He is still just 21 so he should develop more consistency as he ages. The Braves have a very deep pitching staff so they will take it slow with Delgado and give him time to hone his craft.
Webster continues to excel after being promoted to AA. In 3 starts he has a 3.00 ERA in 18 innings. He has allowed only 7 hits in that time but has also handed out 8 free passes. Webster doesn't allow many hits - 7.5 H/9 in his minor league career - so if he can keep the walks down he will be a very good fantasy prospect who provides excellent WHIP and ERA.
Ryan Flaherty - Cubs 2B/LF/SS DOB: 07/27/86 .305/.385/.574
The 2008 first rounder got off to a blistering start posting .350/.407/.675 in April. May was less impressive but still good with .269/.364/.495. He hit 49 extra base hits the past two seasons and is on pace to top that this year. He is alternating between playing second base and the outfield with a few starts at shortstop as well. If he can stick in the middle infield he would have big time fantasy upside since he has plus power at the position. If he moves into the outfield permanently he loses a lot of value.
Paul Goldschmidt - Diamondbacks 1B DOB: 09/10/87 .349/.467/.693 48/43 BB/K
Goldschmidt leads the minors with 20 HR and is 8 HR ahead of his closest Southern League rival. He had prodigious power as an amature and has carried it over into pro ball. He has a career minor league ISO of .306. As long as injuries don't get in his way he should win a home run title in majors one day. If you don't know he's a must own in keeper leagues by now, it's too late. The Diamondbacks are in no rush to promote him but I think there is a good chance he sees the bigs this year. If he is promoted he is well worth picking up.