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Which pitchers have lost velocity over the past few seasons, and why?

In last week's episode of Raising Aces, we looked at those pitchers who have increased fastball velocity over the last three seasons. The article was inspired by the general tendency for pitchers to lose velocity as they age, and with this premise in mind, I decided to flip the switch and go digging for those pitchers who have lost some speed over the past three years.

For the purposes of this analysis, I chose to utilize the same threshold as with the pitchers who were over the radar: to qualify for the study, a starting pitcher had to have thrown at least 500 fastballs (or sinkers in select cases) in both the 2012 and 2011 seasons, and the average velocity of those pitches in 2012 had to be at least 0.50 mph lower than in each of the previous two seasons. The purpose of these boundaries is to capture a sustained loss in velocity across multiple seasons.

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