Atlanta designated Harris for assignment Wednesday.
The transaction clears a spot on the 40-man roster for Elieser Hernandez. Harris has had major control problems in the minors this season, issuing 37 walks over 48.2 frames to go along with a 5.55 ERA between Double-A Columbus and Triple-A Gwinnett. However, the lefty has also struck out 64 batters during that time, and he boasts a career 35.1 percent strikeout rate in the minors. There should be interest in Harris via waivers.