Harrison (back) will make a rehab start Wednesday at Triple-A Round Rock, Anthony Andro of FOXSportsSouthwest.com reports. Harrison is expected to cover around 85 pitches in the start, after previously tossing 77 pitches in an extended spring-training game during the past week. The left-hander hasn't pitched in an MLB game since April 2013 after undergoing back surgeries each of the past two seasons, providing an uphill battle for him in his quest to reestablish himself as a useful rotation member for the Rangers. He'll likely require several rehab starts before the team activates him from the DL.