"He's making progress," Rangers general manager Jon Daniels said. "I've seen some video on what they're working on mechanically and he looks better. We knew it would be a process. We want to make sure he gets it right. If that means additional time, we want to make sure he gets it right. He could probably come up here now and compete and get people out.
"But he can be a dominating back end of the bullpen piece and we want to make sure he gets it right."
Feliz was the Rangers closer in 2010-11 when they went to the World Series but underwent Tommy John surgery in 2012 after he was switched to the rotation. He is still not all the way back to where he was before the surgery.
T.R. Sullivan is a reporter for MLB.com Read his blog, Postcards from Elysian Fields and follow him on Twitter @Sullivan_Ranger. This story was not subject to the approval of Major League Baseball or its clubs.