Before being involved in bus crash with his Class A Carolina teammates in May, Sims was starting to show why the Braves selected him in the first round of the 2012 First-Year Player Draft. A hip injury suffered in the crash sidelined him for six weeks. But he earned a promotion to Double-A Mississippi in July and quickly made a successful adjustment to the enhanced level.
Sims has produced a 3.54 ERA and recorded 49 strikeouts in the 40 2/3 innings he has completed for Mississippi. During his past five starts, the 21-year-old right-hander posted a 1.55 ERA and limited opponents to a .