For example. I'm looking at Travis Hafner. We all know he had a huge decline last year and I wanted to investigate why. As has been noted here at the cafe, he stopped hitting flyballs at the same rate - he went from 40% to 34% FB% - but, also, he took a big hit in HR/FL%. A whopping 30% of Hafner's flyballs when for homeruns in 2006. In 2007, only 15% of those flyballs went for home runs. This suggests that he's still getting it in the air somewhat - but not as much as in 2006 - but without the power to make those balls clear the fence. This is quite disturbing. He needs to both increase his FB% to normal levels and ALSO increase his HR/FB % to regain his former value.
In evaluating whether or not he can do this, it would be nice to analyze whether or not other players from the past, similar to Hafner, have been able to rebound in such a way from an abnormal FL% and, especially, a HR/FL%. Does anyone know how I could possibly search for players who have had a similar drop-off, but were able to turn things around.
Finally, I know there was a wrist injruy at some point. Could that have affected that crazy FB% / HR/FB % ?