On May 20, 2011 — After being shut out by the Mets in back-to-back games, the Nationals have their biggest offensive game since moving to Washington, DC in 2005. They beat the Orioles, 17 – 5, launching 6 homers. Jayson Werth hits two of the long balls, and Danny Espinosa, who collects 6 RBI, Roger Bernadina, Wilson Ramos and Laynce Nix hit the others. Both the 17 runs and the 6 homers are team marks since the move to the nation’s capital.

Source:
Baseball Reference May 20