Harrison (0-1) gave up six runs on six hits and three walks while striking out one in four innings against the Diamondbacks on Wednesday. Harrison, an All-Star in 2012 before back problems surfaced early the next season, was activated from the disabled list Saturday and made his first appearance in over a year. He made his previous start on May 13, 2014, against Houston, when he left with back stiffness about a month before career-threatening spinal fusion surgery. It was the last of three procedures for back problems that limited the left-hander to six appearances over two seasons. Harrison, who threw in the mid-90s before he started having back issues, hit 87 mph with his first fastball, but couldn't go above that.