Klimesh was originally a 15th round pick by the Reds out of Trinity University. Used primarily as a reliever in his professional career, Klimesh has shown the ability to pump his fastball up to the mid- to upper-90s. Though he has enjoyed high strikeout numbers due to this velocity and stuff, he also has seen issues with command in his career. With elevated hit and walk numbers, Klimesh saw a WHIP of 1.85 between Pensacola and Louisville in 2015. Klimesh started the 2016 season on the DL.