The Boston Red Sox placed closer Tanner Houck on the 15-day injured list Tuesday with lower back inflammation.
The move, executed just ahead of Boston's game Tuesday night against the visiting Atlanta Braves, is retroactive to Saturday.
In a corresponding move, the Red Sox recalled fellow right-hander Kaleb Ort from Triple-A Worcester.
Houck, 26, hasn't pitched since a five-out save last Tuesday in Houston.
Houck is 5-4 with a 3.15 ERA and eight saves in 32 games (four starts) this season. He's 9-9 with a 3.02 ERA in 53 career games (20 starts) in three seasons with the Red Sox.
Ort, 30, has a 9.49 ERA in 10 appearances without a decision this season.
--Field Level Media