Scouts say the 6-foot-3, 190-pound Shields has the arm to go in the first two rounds, even if they didn't see it this spring. He was laid up with a back problem, limiting him to six innings of work entering the homestretch of the season. When he did pitch, he wore a brace on his back. With a scholarship to LSU to compete with, teams may consider him too big a risk to squander an early pick.