David Peterson tossed seven innings of one-hit ball and earned the win Sunday afternoon for the visiting New York Mets, who ensured themselves an opportunity to play for a postseason berth Monday by beating the Milwaukee Brewers 5-0.

Key to the Mets’ effort Sunday — and, in a ripple effects way, Monday — was lefthander David Peterson, who tossed seven shutout innings to lower his ERA to 2.90. He allowed one hit and three walks and struck out eight.