Harrison (back) is expected to throw one more extended spring training game Saturday, at which point he could head to Double-A Frisco on a rehab assignment, Jeff Wilson of the Fort Worth Star-Telegram reports. Harrison has been sidelined since early last season after undergoing spinal fusion surgery last June. He finally appears to be making some progress towards a return to the mound. If all goes well in his extended spring training start, he could move on to beginning a rehab assignment before an eventually rejoining the Rangers.