The Rays optioned Bradley to Triple-A Durham on Tuesday, Marc Topkin of the Tampa Bay Times reports.
Topkin notes that a major reason for the move is to transition Bradley to a traditional five-day schedule as opposed to the six-day schedule he's been working on. The Rays are expected to replace Bradley in the rotation with Yonny Chirinos and/or Josh Fleming. Bradley is still likely to be a major part of the Tampa Bay pitching staff this season, though as a result of the demotion, it's possible that Tyler Glasnow (oblique) beats him back to the big-league rotation.