Rich provides an update on the hot prospects of week 21. Nolan Gorman (STL, Triple-A)2. Triston Casas (Bos, Triple-A)3. Francisco Alvarez (NYM, Double-A)4. Jordan Westburg (Bal, Double-A)5. Corbin Carroll (Ari, Double-A)6. Matt McLain (Cin, Double-A)7. Robert Hassell (SD, High-A)8. Ceddanne Rafaela (Bos, High-A)9. Jordan Lawlar (Ari, Low-A)10. Marcelo Mayer (Bos, Low-A)11. Peyton Battenfield (Cle, Triple-A)12. Ken Waldichuk (NYY, Double-A)13. Brett Kerry (LAA, Double-A)14. George Kirby (Sea, Double-A)15. Nick Nastrini (LAD, High-A)