Petit (2-1), who made a spot start for Matt Cain, allowed three hits and struck out four to earn the win. Cain was scratched from his scheduled start after cutting his right index finger.
Eric Stults (1-3) took the loss for San Diego after allowing five runs on seven hits with two walks and a strikeout over 2 2/3 innings.
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UPI Sports Results for September 19, 2014