Humberto Castellanos is a name that may or may not ring bells for most of us, but for the 2021 Diamondbacks he was an emergency call up that supplied essentially replacement level value in a reliever/emergency starter role. That’s not a description that necessarily inspires hope on the surface, but a deeper dive into the context of his career and Statcast numbers shows many reasons for optimism (at least for those of us that have huffed enough Copium).
Signed during the 2015 J2 Period out of Mexico by the Astros at 17 years-old, Castellanos began his professional career as a SP in 2016.