Merrill Kelly to Throw Bullpen Session After Back Tightness

Merrill Kelly (back) is scheduled to throw a bullpen session Thursday, according to Diamondbacks manager Torey Lovullo. Kelly experienced mid-back tightness shortly after camp opened, ruling him out of Opening Day starts. However, he has a chance to avoid the injured list and make a start in the second series of the season. A return to the mound Thursday is a significant step toward that goal.