A very quick graph today for something I’ve been meaning to do since the offseason when RJ signed. Here’s a PFX movement plot of Randy Johnson’s 2008 season.
A few quick words on the graph:
- The pitch-types included are all from the MLBAM algorithms and their accuracy has been disputed somewhat. Consider this plot a rough version of what Johnson throws until I get some things ironed out.
- The pitch-types are: FA (fastball), CH (changeup), FS (split-finger fastball), CU (curveball), SL (slider).
- To my knowledge, RJ doesn’t throw a curveball . The curveballs that PFX tracked could very well be sliders. Whether or not he throws a split-fingered fastball is up for debate as well. I’ve read in some places that he does and in other places that he doesn’t. You’ll notice that there’s a large section of fastballs in the middle of the graph that looked misplaced from the other large amount of fastballs, these are probably 2-seam fastballs.
- Positive break on the x-axis is movement away from a right-handed batter. Negative break on the x-axis is movement towards a right-handed batter (or away from a LHB).
Johnson is primarily a fastball (2-seam, 4-seam, split-finger) and slider pitcher. Here’s what his total pitches thrown by pitch-type looks like:
And, again, with the algorithm I’m using, I wouldn’t be surprised to see these percentages shift around a little after I’ve improved some things. But, as a rough-sketch, they should be decent. As I improve my database, I’ll have more (hopefully accurate) information to post.