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Is there a sweet spot for velocity?

Most of our writers didn't enter the world sporting an @baseballprospectus.com address; with a few exceptions, they started out somewhere else. In an effort to up your reading pleasure while tipping our caps to some of the most illuminating work being done elsewhere on the internet, we'll be yielding the stage once a week to the best and brightest baseball writers, researchers, and thinkers from outside of the BP umbrella. If you'd like to nominate a guest contributor (including yourself), please drop us a line.

Jonathan Hale has been using PITCHf/x to answer baseball questions all over the 'net since 2008. He once missed a Duane Ward curveball by three feet. You can read his writing about the Blue Jays or tell him what he should be analyzing next at The Mockingbird.

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The advent and adoption of the PITCHf/x system has changed the way we scout pitchers, and more advances are still to come.

Believe it or not, most of our writers didn't enter the world sporting an @baseballprospectus.com address; with a few exceptions, they started out somewhere else. In an effort to up your reading pleasure while tipping our caps to some of the most illuminating work being done elsewhere on the internet, we'll be yielding the stage once a week to the best and brightest baseball writers, researchers and thinkers from outside of the BP umbrella. If you'd like to nominate a guest contributor (including yourself), please drop us a line.

Adam is the founder of Project Prospect, a scouting and statistical analysis website. He has been writing about baseball since 2006, when he began covering college baseball and conducting quantitative analysis of  minor-league prospects.
 


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April 23, 2009 12:30 pm

Checking the Numbers: Inside Pitch-f/x

31

Eric Seidman

Dissecting a day at the office for the Mets' Johan Santana.

Due to local blackout rules and the lack of a land-line phone capable of proving that my Penn State University residence was not in Philadelphia, I relied on MLB Gameday instead of MLB TV for a good chunk of the 2007 season. The application had been around for a while, but I soon noticed strange terminology and new data accompanying each pitch. Why are there two velocity readings? What does 13" of pFX mean? And what the heck is BRK? A little research soon made sense of the information, and within a few months I became hooked on the data set known as Pitch-f/x. Fast-forward two years, and Pitch-f/x continues to evolve, revolutionizing baseball research in the process. Unfortunately, with updates to system configurations and the amount of information offered, too many readers and baseball fans experience confused reactions similar to mine when they first encounter the data. In an attempt to quash this issue, it seemed prudent to explain some of the more commonly used numbers, discussing what they mean as well as how they should be used. Instead of merely defining terms, the system will be explored in action, with periodic discussions of its inner workings, much as Dan Fox did back in May 2007.

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June 9, 2008 12:00 am

Ballad of the Fatigued

0

Eric Seidman

How do starters who throw particularly high pitch-count initial innings perform subsequently?

Delivering to the dish with a 2-2 count, Wandy Rodriguez hit the outside corner with a 91 mph fastball with which Edgar Renteria could do nothing but whiff. This heater happened to be the 55th pitch that Rodriguez threw in the inning on August 1, 2007. While the pitch brought the inning to a close, it simultaneously placed Rodriguez atop a list of the pitchers who had thrown the most pitches in a single inning. Compiled by Retrosheet's David Smith and posted on the Inside the Book blog, the list is composed of the pitchers with the most pitches thrown in an inning from 2004-2007.

I decided to examine the Pitch F/X for Wandy's game. Analyzing the velocity and movement of Rodriguez's fastball, I was surprised to find that his fastball sustained its velocity and "bite" as he went deeper into the inning. However, during the rest of the game things changed a bit. In the second inning, his velocity lost three miles per hour, but his movement increased. It has been theorized before that some pitchers may throw with more movement when they tire due to a dropping of their arm angle; perhaps this happened here, as Wandy lost velocity but threw with more movement.

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Some prospects are up in The Show, some are just up, and some really aren't. Who among our top 100 are headed in which direction?

1. Alex Gordon, 3B, Royals
Eligible Next Year? No
Stock Movement Since Ranking: Unchanged



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