Harrison (back) threw from 75 feet but won't throw off of a mound until the middle of March, Jeff Wilson of the Fort Worth Star-Telegram reports. Harrison underwent spinal fusion surgery in his back last June, but he appears on track for a 2015 return despite initial concerns that it could be a career-ending injury. At this point the hope is that he'll be fully healthy by mid-March, but there will still be a long way to go before making a return to the big leagues so an exact timetable for the 29-year-old is hard to figure as of now.