Detwiler, 29, was released by the Rangers midway through his first season in Texas. He had a record of 0-5 with a 7.12 ERA over 17 appearances, seven of which were starts.
Before his stint in Texas, Detwiler had success over seven seasons with the Washington Nationals, the team that selected him sixth overall in the first round of the 2007 draft. Detwiler posted a 3.82 ERA over 471 innings in Washington and pitched six scoreless innings in the first playoff series in Nationals history.
The lefty was traded to the Rangers for two minor leaguers following the 2014 season when the acquisition of Max Scherzer left no room for Detwiler on the Nationals' crowded pitching staff. He had already been pushed out of the rotation and into the bullpen by the emergence of Tanner Roark.
The Braves enter Friday night with a 42-47 record, 7.0 games out of first place in the NL East.
- Erin Flynn