Like These (Baby) Changeups
Whether it’s daily fantasy or dynasty, being able to evaluate a pitcher in a small sample can separate the top from the bottom of your league table. Results — particularly balls in play, but really any results that depend on the outcome of a plate appearance — can only go so far. Per-pitch metrics help, since there are four pitches per plate appearance on average, but if you’re talking results, you’re still cutting your sample into those moments when a player swung or put the ball in play.
And then there’s movement and velocity. We know, for example, that it takes only three starts to reliably predict fastball velocity the rest of the way, and that one start actually gives us a good idea. So maybe movements and velocities can help us evaluate young starters quickly.