Keith Hessler

Hessler joined the Padres after being claimed off waivers from Arizona in May, and he spent the rest of the 2016 season shuttling between El Paso and San Diego. After losing more than a mile-per-hour off his fastball from 2015, Hessler's strikeout rate slipped from 21.1 percent to 10.7 percent in his first season with the Friars. With a fastball-slider combo, the 28-year-old lefty should get another opportunity to stick in 2017, especially since he was effective during his time at El Paso (28.0 percent strikeout rate, 8.0 percent walk rate) while allowing just one home run over 36.2 innings in the hitter-friendly environments of the Pacific Coast League. Unfortunately, he's no lock to remain on the 40-man roster as the Padres may elect to use his spot on a younger player with a higher ceiling.