MRI shows a flexor-pronator strain, "as good a news as you can expect from an injury (to the elbow)." Nothing related to the UCL. He won't throw for five days, after which he'll be re-evaluated. Khalfayan doesn't expect him to miss much action, although he was reluctant to give a timetable for Felix's return (update: sounds like 10-20 days, could go to a month if given a rehab assignment). Also said it's similar to what Putz was dealing with a few weeks ago.
I am happy.
Another update: "This is a very common pitcher injury," Khalfayan said. "Felix's injury is minor. We are optimistic he won't miss too much time."