In his worst full season as a major league reliever, Dellin Betances struck out over 15.5 batters per nine innings. Prior to his now-infamous September struggles, Betances had a 2.12 ERA with under three walks per nine innings, striking out 44.4% of the hitters he faced. Despite a messy September and an even messier spring with Arbitrationgate, Betances may be gearing up to have his best season of all in 2017.
There are a few indicators of how ridiculous Betances is poised to be in 2017. In 2016, his fastball was actually very hittable, with hitters posting an OPS of 1.