Royals manager Ned Yost described the injury that forced Danny Duffy from Sunday's start as "medial left elbow tightness." It's a concern because the young left-hander had to have a start skipped last month due to elbow tightness and this ailment is being described as similar to that. The 23-year-old lefty has been inconsistent all season, but he entered play on Sunday 2-2 with a 4.00 ERA and solid 9.0 K/9. Monitor his status as you make your lineup decisions for the coming week.