There was some controversy when Jake Peavy pitched on short rest in his last start in Arizona. As it turns out, Peavy got hammered. It was by far his worst start of the year giving up 8 runs in 4 innings. It’s certainly tough to tell how much the short rest affected the poor performance, but you have to figure it at least had some impact on Peavy’s night. I thought I’d take a peak into the gameday data to see if he did anything different on short rest.

Let me first say that these first few graphs are very messy. If you don’t see anything here, I don’t blame you. The picture is even worse when you transfer it into wordpress and there are a lot of colors and a lot of dots, etc. I figured since I did it, I’d share it, but I’m not sure if you’ll get anything out of it. Anyhow, I retrieved every Peavy start from August 2nd to September 5 (except his Aug 27th one … no data there) and attempted to see if there was any difference in what he brought on Wednesday night. The first one here is simply pitch speed on the y axis and pitch count on the x axis. I tried to make all of the other starts lighter colors and his last one black.


There are some missing pitches early in his last start. Again, not sure if there’s anything here. He definitely didn’t have his best velocity, so that may be something. Later in the game it appears his lost some speed on his fastball and it wasn’t quite coming as fast as usual, so I suppose that could be a sign of tiring.


The next one is movement, with horizontal break on the x axis and vertical on the y. One thing I noticed here was the lack of pitches in the area that I circled. His pitches, overall, seemed to have a lot of movement, but maybe a little less velocity as we saw above.

Alright, enough with that for now. Since I have all of these starts in a spreadsheet, I figured I’d take a look at all of his pitches. Here are a few more graphs with all of Peavy’s pitches (that were tracked) since August 2nd.


This one is just start speed vs end speed. You can see 4 different pitches here, I think. In the 90+ range you have a large cluster of fastballs. Next, in the 85-89 range you have a grouping of sliders. From 80-84 is another group of sliders (or slurves). And then finally in the low to mid 70’s range are the rare curve balls (and maybe a few changes).



The next two are velocity vs horizontal and vertical movement. On the second graph, the only negative vertical breaks are Peavy’s rare curveballs. In the data I have for Peavy, he only has 37 pitches with a negative vertical break value. 23 of those pitches were to lefties, so it appears Peavy like to unveil the curve against left handers — in the rare times when he chooses to use it at all.

That’s it for now. As I always say at the end of these … I’m just getting used to them … just messin’ around a little. There’s a lot of great (much more refined) work being done out there and you can find it all at Fastballs. I don’t know if you’ll find anything useful in what I just posted, but I figured I’d throw it up anyway. If you like it, don’t like it, or have any suggestions for me … let me know.