The D-backs continue their series against the Padres on Friday night at 7:10 p.m. MST on MLB.TV, with right-hander Merrill Kelly on the mound. Kelly was one of the D-backs’ better pitchers last year before having thoracic outlet surgery in September. He had no health issues this spring and was bumped up from the No. 3 spot in the rotation to No. 2 after an injury to Zac Gallen. Left-hander Blake Snell will start for San Diego.