#27: Jon Singleton
#30: Carlos Correa
#57: George Springer
#89: Jarred Cosart
Interestingly enough, if we look back to the 2012 MLB.com Top 100 Prospect List, the Astros had
#25: Jon Singleton
#34: Carlos Correa
#48: George Springer
#76: Jarred Cosart
#77: Delino DeShields, Jr.
Comparing the two, Correa and Springer advanced their rankings, while Singleton and Cosart dropped, and DeShields dropped off the list entirely.
In 2011, MLB.com only listed 50 top prospects, and the Astros didn't place anybody on the list. Only Jon Singleton was ranked at all, and he was #32. Matt Dominguez, acquired in the Carlos Lee trade (which I still have a hard time believing ACTUALLY HAPPENED), was #35. Both were, of course, in the Phillies' and Marlins' systems at the time.
So...yay!