Harrison will likely try to throw batting practice on Thursday. He has been throwing for two months, and this is the first issue he has had. It would hardly be a concern except Harrison missed almost all of last season because of a herniated disk in his lower back. Harrison had two surgeries on his back and another on his right non-throwing shoulder.
Reliever Tanner Scheppers was also scratched due to back spasms. Scheppers, who will be given a chance to make the rotation this spring, also had back problems during Spring Training in 2011, when he was trying to make the rotation.
T.R. Sullivan is a reporter for MLB.com. Read his blog, Postcards from Elysian Fields, and follow him on Twitter @Sullivan_Ranger. This story was not subject to the approval of Major League Baseball or its clubs.