15 Ryan Castellani
A second-round pick who hurls from the right side who spent his age 21 season at Double-A despite being three years younger than the league. Wait, we just wrote about Lambert. OK, so Lambert and Castellani are on the same track and Castellani is just a year older.
Last year the 6-foot-4, 220-pounder, started 27 games to the tune of a 4.89 ERA in 157.1 innings. Castellani put together the same BB/9 (2.7) and K/9 (7.6) rates as he did in 2016 at High-A. He had a 3.99 FIP, which means he may have run into some bad luck.
He will start at Double-A in 2018 albeit could very much earn a mid-season promotion. His mid-90s fastball, polished mechanics and youth could very well have him as big league starter before age 23. More likely, he needs to work on consistency and him and Lambert get lumped together in the same prospect group, which is by no means a bad thing. Castellani and Lambert are two young arms that would be the talk of the town if the other young arms weren’t on this list.