Mason Tobin (elbow) threw for 10 teams Thursday and reportedly touched 94 mph, according to his agent, Steve Canter.
Rangers sent RHP Mason Tobin outright to Triple-A Round Rock.
The Rangers announced that right-hander Mason Tobin underwent elbow surgery Wednesday.
Mason Tobin has been diagnosed with right ulnar collateral ligament inflammation.
Rangers placed RHP Mason Tobin on the 60-day disabled list with a right elbow injury.
Mason Tobin left Tuesday's game with pain in his right elbow.
Mason Tobin has made the Rangers' Opening Day roster.
Mason Tobin will miss workouts Wednesday due to "general soreness."
Cubs selected RHP Mason Tobin from the Angels with the eighth pick in the Rule 5 Draft; traded him to the Rangers for cash considerations.