Boxberger (oblique) pitched a scoreless inning for High-A Charlotte on Tuesday, allowing two hits and a walk.
The rehabbing reliever fired 18 pitches, half of which went for strikes. Boxberger has now allowed two earned runs on five hits and a walk over four innings in four appearances for the Stone Crabs. He's scheduled for another short appearance Wednesday and absent any setbacks, will rejoin the big league club this weekend.