This article is part of our The Saber's Edge series.
What does the spin rate actually tell us that we already don't know with sites like FanGraphs and BrooksBaseball having a ton of information on each pitch? Besides the spin rate, other factors go into the quality of a pitch like velocity, location, deception, release point and other pitches in the pitcher's arsenal. Additionally, some work has already been done on the subject by FanGraphs' Jonah Pemstein in a two-partseries. For each pitch type, he found the contact rate, swing rate, groundball rate, pop-up rate, BABIP and overall value. The post was extremely information heavy, but few new conclusions were provided.
I will start my own study with the basics with the two most common pitches getting mentioned, four-seam fastball and curveballs.
Effects of Spin Rate on Four-Seam Fastballs
The basic fastball is a great place to start because