Peterson didn't factor into the decision Sunday against Philadelphia, allowing one run on four hits and a walk across 7.2 innings. He struck out six.
Peterson and Cristopher Sanchez were locked into a pitchers' duel Sunday, but neither was credited with the victory. Peterson yielded five runs (four earned) in his previous start after yielding two or fewer earned runs in seven consecutive outings. Since the start of August, Peterson is 4-1 with a 2.22 ERA and a 46:17 K:BB across 56.2 innings.