The Hazards of Evaluating Pitchers
Remember fantasy baseball before the PITCHf/x era? I fondly recall arguments over player valuations. “I think” was the primary selling point, usually followed by an outlandish projection based purely in wishcasting. Stats were found on ESPN or Yahoo. In other words, they were unsophisticated. Maybe you were already reading a fledgling FanGraphs where you could peruse any number of articles about how Player X will regress from high/low BABIP. We’ve all come a long way.
Nowadays, I can’t imagine evaluating a pitcher without the help of PITCHf/x. When another site asked me to rate dynasty starting pitching prospects, I basically told them it was a waste of time. There are the guys we already know about, i.e. Julio Urias. Then there is a mountain of muck to throw against the wall. Some of it will stick. Without minor league PITCHf/x (and MLB translations), I lack the necessary tools to find the next Jacob deGrom.
There’s another issue, and it’s the primary purpose of this article – pitchers are not static talents. Command can change suddenly, new pitches may be discovered, or the next Carlos Carrasco might spontaneously figure out how to use his already excellent repertoire. Previously dominant sliders can lose their tilt or hitters might adjust to a predictable high fastball.