Sims has been promoted to Triple-A Gwinnett, where he made his debut Saturday night, the Atlanta Journal Constitution reports.
Sims dominated at Double-A to open the year, striking out 26 batters while allowing just seven hits (albeit with 10 walks) over 14.2 innings. In his Triple-A start, he allowed two runs over five innings, giving up three hits and four walks while striking out four. Unfortunately for Sims, the walks are a feature and not a bug, so enthusiasm for his strikeout potential has to be tempered some.