Peterson (5-2) struck out a career-high 10 batters to pick up the win in Saturday's 7-2 victory over Atlanta, allowing one run on three hits and four walks over six innings.
The 25-year-old rookie hadn't fanned more than three batters in any of his previous six appearances, but Peterson took full advantage of Atlanta's over-eager bats Saturday. The southpaw will take a 3.80 ERA, 1.29 WHIP and 36:23 K:BB through 42.2 innings into his final start of the regular season, Thursday on the road against the Nationals.