Sims will start Friday's Grapefruit League game against the Phillies, MLB.com reports.
He's not a candidate to start the year in the Braves' rotation, but Friday will serve as a sort of audition for a possible in-season promotion to the big club. Sims may pitch in relief during the second turn in the rotation this spring, but will eventually transition to the minor league side. The right-hander turned in a 3.40 ERA and 1.22 WHIP in nine starts after making the jump to Double-A last year despite issuing 29 free passes in 47.2 innings.