The Cubs will face Washington rookie Craig Stammen on Friday night. I looked at him after his debut in May, and he was quite unexciting. Nothing has changed, although I'm no longer sure he throws a sinker (probably just a four-seam fastball, but I'm using the generic FA label for all of his heaters).
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The fastball/change-up combo looks pretty decent (see the flight paths below). Stammen's curveball has an unusually low spin rate, I'm not sure what to make of that, if anything.
Stammen's stuff is quite average, not a lot of grounders, not a lot of whiffs, not a lot of hard hit balls, though. He might be getting lucky in that regard, time will tell.