Young (6-6) walked four batters, struck out five, and threw 66 of his 111 pitches for strikes.
At the plate, he hit a solo home run in the top of the seventh.
Edgar Gonzalez hit a fifth inning two-run homer.
Two others had one RBI.
A run scored on a fielding error by Emilio Bonifacio in the fifth, but no player had more than one hit in the Padres' second win in a row.
They made the most of seven hits and a second Washington error led to two runs in eighth.
Washington averted a shutout on Aaron Boone's eighth inning double.
Three others had one hit in the Nationals' fourth loss in a row.
Losing pitcher John Lannan (9-14) surrendered four runs -- one earned -- and four hits in seven innings with three walks and five strikeouts.