Drew Pomeranz reportedly will return to the big leagues and start for Colorado on Sunday against visiting San Francisco. The left-hander out of Ole Miss, a former first-round pick by Cleveland, is 8-1 with a 4.20 ERA at Triple-A Colorado Springs. He leads the Pacific Coast League in strikeouts with 96. He spent part of 2012 with the Rockies and was 2-9 with a 4.93 ERA working under a stringent pitch limit. … Pomeranz joins Holmes Community College product Roy Oswalt in the Rockies rotation. Oswalt is 0-2, 7.36 in his two starts, both on the road.