Thursday, February 18, 2010
Do ground ball pitchers allow more HR per fly ball?
You’ve heard lots of commentators say that when a ground ball pitcher pitches “up in the zone” he gets hammered, and it seems to make sense.
Matthew Caruth looked at something similar in this Fangraphs post.
As Rob Neyer likes to say, here is the “money quote” from the article:
The best rule of thumb I can state from this look is that a pitcher’s ground ball rate has no impact on his various rates of yielding home runs and what impact there is might actually be negative.
Matthew did not look at pitch location, contact rates, BABIP, or anything other than HR rates per fly ball, per line drive, and per line drives and fly balls combined (it is not clear if he ignored pop flies or not when he combined the two - those are the 3 categories, by the way, that MLB Gameday uses for air balls, I think). And of course there is a fine line between some hard hit ground balls and low line drives.
Nice job!


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