Stites experienced some soreness during a recent throwing session and will kept off a mound for a couple days, Steve Gilbert of MLB.com reports.Stites struggled mightily in 37 appearances with the Diamondbacks last season, but his numbers in 29 appearances between Double-A and Triple-A were much better (2.89 ERA, 1.14 WHIP). Manager Chip Hale stressed that Stites is just sore and no injury is in play, but the right-hander won't be completely in the clear until he returns to mound work.