Waldrop is slated to throw from 120 feet again on Friday. He said everything is going to plan so far, though there isn't a timetable for his return just yet.
"Everything feels good and I'm still on pace to throw a bullpen on Sunday," Waldrop said. "Everything is moving in the right direction. So we'll take it a day at a time, but it's going well so far."
Waldrop said the MRI taken on his elbow during Spring Training showed inflammation and a minor strain in his ulnar collateral ligament. But he said the inflammation went away and his UCL feels better after not throwing for more than two weeks.
"I haven't had any issues with that," Waldrop said. "I feel pretty good. We took some time off and did some strengthening exercises around the UCL. We tried to take some time off from using the ligament to let it heal itself. So is everything is working as planned so far."