Julio Teheran will be the Braves' fifth starter to open the season, manager Fredi Gonzalez announced.
The 22-year-old came into camp fighting for a job at the back-end of the rotation, but performed well enough to earn the spot this spring.
Teheran has long been considered a top pitching prospect, and will now have a chance to show what he can do at the major-league level.
Teheran struggled in Triple-A last season, posting a 5.08 ERA in 131 innings.