Beware, worms!
Yesterday, one day before he would have opted out of his minor league contract, the Tampa Bay Rays promoted reliever Ronald Belisario to the major league team. Belisario has been a very good pitcher in the past, highlighted by 2012, when he put up a 2.54 ERA with a 24% strikeout rate, a 10% walk rate, and a 65% groundball rate.
In the two years since then, Belisario has put up much less impressive 16% strikeout rates, and his 2014 campaign featured a bloated 5.56 ERA, but fielding independent pitching metrics like FIP and xFIP still liked him, thinking he deserved a ERA closer to the 3.