Josh Collmenter (forearm) is scheduled to throw a bullpen session Sunday. If the session goes well, Collmenter will make his second Cactus League start on Wednesday. The right-hander skipped his previous start due to forearm tightness, but the Diamondbacks are convinced it's not a big deal. Collmented posted a 3.59 ERA in 24 starts last season and will hold down a rotation spot again in 2012.