Archive for November, 2006

Pitch Location & Groundballs

Last week Baseball Analysts published my article Generalities in Pitch Location, which led Tangotiger to ask the following question:

“…how often does Brandon Webb and his brothers get a GB on balls thrown down and balls thrown up the zone. That is, are they “true” groundball pitchers, who can get batters to hit the ball on the ground, because they can. Or, are they groundball pitchers, as a byproduct of them throwing the ball low?”

First let’s take a look at ground ball percentage by pitch location on a major league level.

MLB GBP Location.png

I don’t think there are too many surprises here. The lower the pitch, the greater the chance that it will be hit on the ground. So, let’s look at what Brandon Webb‘s (extreme groundball pitcher) chart looked like the past two season, compared to say Barry Zito’s (extreme fly ball pitcher).

Webb GBP Location.png

Starting with Webb, we can see that no matter where he throws the ball, there’s a pretty good chance it will end up being a groundball. Zito on the other hand, will have a greater chance of inducing a fly ball despite the location of the pitch.

Zito GBP Location.png

Now if you were to calculate a so called, “expected” groundball percentage based on the pitch locations of balls hit into play for a particular player and the league average groundball percentage for that particular pitch location, you’d see that Webb has an expected GB% of about 48%, while Zito’s is 44%.

All in all, a pretty similar “expected” groundball percentage based on pitch location and major league averages, but in reality the two couldn’t be further apart. Webb’s actual GB% the past two years is about 66% with Zito’s being around 39%.

It would seem, at least in the case of these two pitchers, that their ability (or lack there of) to induce groundballs is not entirely a function of where they throws the ball, but probably reliant on several other factors.

On Baseball Analysts: Pitch Location

Thought I’d mention that I have an article on Pitch Location running this week on Baseball Analysts. Here’s a little teaser….

“How often have you heard a player attribute his success to “throwing more pitches inside,” or heard a manager say a pitcher was “hitting his spots?” Pretty much everyone talks about pitch location, but how often is it actually quantified? Thankfully, our pals over at Baseball Info Solutions tracked the x-y coordinates of nearly all 1.5 million pitches thrown the past two seasons. Let’s start by looking at the average major league pitch locations broken down by batter/pitcher handedness.”

You can find the rest of the article here: Generalities in Pitch Location