Pomeranz improving, but opener not a given

With a rash of injuries in the back half of the rotation this spring, the Red Sox’s early-season rotation is in flux. Manager Alex Cora isn’t ruling out the possibility of having one of the team’s former All-Stars ready for when Boston opens the regular season later this month. Drew Pomeranz has a chance to be ready for the Red Sox’s first series in St. Petersburg, Fla.