via www.fangraphs.com

That's Joe Nelson's fastball velocity chart.  Either every PitchFx machine he's thrown in front of this year is slower than those last year, or there might be something larger at work here. Nelson threw about 900 pitches all of last season, he's near 400 this year and we're barely 40 games in. A history of labrum tears and elbow surgeries have surely taken their toll, but boy, seeing such a depressed velocity on a constant basis coinciding with a run of ineffective outings sure does make the mind wander and wonder.