Is Throwing Harder Hurting Kenley Jansen?
Just over a month ago, Dave Cameron made an astute observation: Kenley Jansen was suddenly throwing harder in the earliest part of the season. Or as he put it, “PITCHF/x has already classified more 97+ mph pitches from Kenley Jansen this year than it did all of last year.” And since Jansen was already a hard-throwing and dominant closer with an unhittable pitch even before the velocity jump, it made for an interesting proposition. Namely, what would hitters do against a Jansen who was actually throwing harder? What happens if you take someone who is one of the three or four best in the world at what he does, and then give him something more to work with? What then?
Six weeks into the season, Jansen now has one more 97-plus mph pitch (21) logged than in his entire career through 2013. He’s also already allowed more than half as many earned runs as he allowed in any of the last three years, and he has four meltdowns as compared to eight in all of 2013. Hitters have a .276/.349/.408 line against in 2014, as opposed to .158/.245/.249 previously. He’s throwing harder, finding less success despite it, and, well, baseball is just the worst sometimes. (This may be residual Jose Fernandez anger.)
This has led to a pretty predictable narrative: Jansen is throwing harder…
…and it’s because of that that he’s had problems. Causation! It implies correlation, except when it doesn’t.