Yankees place Justus Sheffield on the DL

Justus Sheffield, the top Yankees’ pitching prospect who was pulled in the fourth inning of his start with Triple-A Scranton/Wilkes-Barre on Friday night because of shoulder stiffness, was placed on the seven-day disabled list Saturday. “You’re always concerned when you hear that,” manager Aaron Boone said of the shoulder discomfort. “Hopefully, it’s nothing too serious.”…