Long and lean, it is easy to project where Roberts could be in a couple of years.  The arm is athletic with well above average arm speed through a high-¾ release.  He sprayed the fastball a bit in this outing, but was the first on the bump after the rain delay, and pitched through a steady mist in his two innings of work.  The fastball bumped 90, sitting 84-88 with solid arm side run, spinning at 2250rpm.  The slider should be a weapon as he continues to progress, ranging 73-76 with short, late, horizontal action.