Matt Harrison (back) allowed two runs on three hits and a walk over two innings in a rain-shortened rehab start with Double-A Frisco Thursday. Harrison labored through a 31-pitch first inning, allowing three extra-base hits and a walk. He then settled in with a perfect second frame before a leadoff double in the third, at which point the skies opened up. Harrison had been slated to throw 65 pitches or four innings but wound up only getting his pitch count up to 41. He was throwing in the 89-90 mph range, which was down from the 90-93 mph he was sitting at in Arizona. Harrison is aiming to rejoin the Rangers' rotation on April 23.