Fangraphs on J.J. Putz

Golebiewski:

Vertical movement on Putz’s fastball and splitter, 2007-2009
2007…
Difference in vertical movement: 4.5 inches

2008 …
Difference in vertical movement: 5.8 inches

2009 …
Difference in vertical movement: 7.1 inches

There’s now a pronounced difference in vertical movement between Putz’s fastball and splitter. Perhaps there’s a point of diminishing returns with the separation between those two pitches: if there’s too much of a difference, hitters will be able to distinguish between the fastball and splitter and simply lay off those tumbling off-speed pitches they once flailed at. …

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