Baumler (ribs) began throwing live batting practice Monday, Jeff Wilson of AllDLLS.com reports.
Baumler has been on the injured list since April 5 due to a right intercostal strain, but he appears to be nearing the final stretch of his recovery. The Rangers haven't announced a firm timeline for his return, but they have confirmed he will require a few rehab outings in the minors before returning from the IL.