I'll be using Josh Kalk's Pitch-f/x data summaries, available for most pitchers at http://baseball.bornbybits.com/plots/players.html. The set of pitchers studied includes all the "important" pitchers, where important is defined by me, plus Tomo Ohka. Pitch classifications are normally left at the Kalk defaults with two exceptions:
- Roy Halladay's slider was renamed as a curve. Almost everyone considers this pitch a curveball.
- A.J. Burnett's sinker was changed to a plain fastball. He often works "fastball up, curveball down" so I don't think those are sinkers.
How reliable is the data?I can't find it now, but there was an article discussing how the pitch speed at Rogers Centre was artificially high. Also, we don't have every single pitch for all of these pitchers. Baseball-Reference.com records the number of pitches thrown by each pitcher in 2007 and the Kalk data provides a count. I've summarized these numbers below:
Other general warnings about the accuracy of the Pitch-f/x system as a whole apply.
What do they throw?Glad you asked.
|Pitch type and frequency (%) for Toronto Blue Jays pitchers|
Or, graphically (click for larger version):
(You'll note that Ohka wasn't included in the pitcher coverage table. I actually added him near the end of my analysis, just so we could have a good laugh. He doesn't even have 500 pitches recorded by Kalk.)
This seems like a decent introduction for now. Consider those tables for a while and let me know what you'd like to see next (or do it yourself!)