Grady Sizemore and Cody Asche had two hits apiece for Philadelphia.
Hernandez (6-8) allowed an unearned run on five singles. He retired the last 10 batters he faced and 17 of the last 18. Over his last four starts, Hernandez is 3-0 with a 1.88 earned run average, including two wins against Washington while allowing no earned runs over 15 1-3 innings.
Jonathan Papelbon pitched the ninth for his 26th save. He allowed a pair of one-out singles before striking out Bryce Harper and Nationals newcomer Asdrubal Cabrera.
NL-East leading Washington has lost four of five.
Doug Fister (10-3) took his first loss since June 15, allowing two runs and six hits in seven innings.
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