FanGraphs' Marc Hulet posted the Astros' 15 top prospects. Click the link for the descriptions, but here's the list:
1. Jonathan Singleton
2. George Springer
3. Jarred Cosart
4. Brett Oberholtzer
5. Paul Clemens
6. Jonathan Villar
7. Domingo Santana
8. Delino DeShields, Jr.
9. Telvin Nash
10. Adrian Houser
11. Austin Wates
12. Mike Foltynewicz
13. Jack Armstrong, Jr.
14. Ariel Ovando
15. Kyle Weiland
Sleeper: Jordan Scott