Young, Murphy and Juan Lagares each supplied three hits and two RBI, while Omar Quintanilla also drove in a pair for New York, which banged out 17 hits in all.
Wheeler (7-3) yielded two runs on five hits over 6 2/3 innings, walking one and striking out three.
Washington's Dan Haren (8-13) was roughed up for seven runs on nine hits in a 2 2/3 inning effort.
Denard Span went 3-for-5 with an RBI for the Nationals.
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