If you follow my New Arms of the Week series at Beyond the Box Score, you're already aware of my mild obsession with fresh PITCHf/x data. Fresh, as in "we haven't seen that guy before." Well over 100 pitchers made their major league debuts in 2009, and I reviewed most of them at some point. I spent some additional time this off-season updating the pitch classifications for each 2009 rookie. There are a few good stories lurking about in the data, so let's dive in.
The Hardball Times
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