Deterioration? What deterioration. You can talk about Perkins' deterioration, but this is what Kevin Jepsen has been. 2015 .242 BABIP, 81.9 % LOB, 7.4 HR/FB & 3.85 SIERA, 4.04 xFIP 2016 .328 BABIP, 68.4 % LOB, 14.7 HR/FB & 4.34 SIERA, 4.86 xFIP Velocity of FB, SL, and CH are the same. Had they dropped to Perkins' levels then we can talk about deterioration. 2016 is a just below average season for Jepsen. He is almost 32 and declining, but not deteriorating (like the Twins' proven closer) by any means... Jepsen is a decent middle reliever who pitched way over his head last season and has fallen to the ground. Hard. Lucky that Ryan did not extend him too. He is what he is. Unfortunately too many people did not look at his peripherals in 2015 and thought that he would be more. Simple. The only thing that deteriorated was (some) people's dreams about who Jepsen was.