Baumler (intercostal) will begin a rehab assignment for Triple-A Round Rock this week, MLB.com reports.
Baumler has been given the green light to head to Round Rock after he recently resumed facing live hitters at the Rangers' spring facility in Arizona. The Rangers want to see Baumler make appearances on consecutive days and throw multiple innings during his time in the minors before bringing him back from the 60-day injured list. The rookie Rule 5 Draft pick has been on the shelf since April 5 due to a right intercostal strain.