Ever since Major League Baseball has been classifying pitch types and publishing that data on the web, I’ve been fascinated with it. It’s not perfect, but it gives us an idea of how good each pitcher is at each particular pitch he throws. Fangraphs has taken the data a step further and attempted to quantify some of this data futher. There are numerous ways to slice and dice that data, and I’ve attempted one below.

I decided that I wanted to visualize how each of the projected Royals starters in 2011 threw each pitch in 2010. What you’ll find below is a graph I put together using Google Gadgets which attempts to do this. Each dot represents a pitch thrown by one of the 2011 Royals projected starting rotation in 2010. The size of that dot represents how often he threw that pitch. The left axis represents the velocity of the pitch. The bottom axis is the weighted value of the pitch per 100 times thrown from Fangraphs (basically how good the pitch is). If you hover your pointer over each dot, you will see whose pitch it represents. The Gadget also lets you change some of the parameters or just look at certain data points.

What I learned is that no pitcher in the 2011 rotation has a good fastball–every one of them lies in the negative territory. Vin Mazzaro has a good slider and changeup and Hochevar should probably be throwing his slider and changeup a little bit more than he does. What jumps out at you?

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