Dobbs drove in Florida’s first run in the first on a groundout, scoring Omar Infante who had tripled. He added another run-scoring single in the seventh and two more on a single during Florida’s five-run ninth inning.
Cubs 13-3 on July 16.
Ricky Nolasco (7-7) rebounded from his worst performance of the season and pitched into the sixth inning, allowing two runs on three hits, as Florida won its third straight.
Laynce Nix homered for Washington, which has lost three in a row and five of its last six.
Jordan Zimmermann (6-9) gave up six runs on eight hits with five strikeouts. It was the second straight loss for Zimmermann, who also allowed six runs at Houston in five innings July 19. Zimmermann had given up fewer than six runs in each of his first 18 starts this season.
Florida’s Emilio Bonifacio led off the third inning with a double to extend his hitting streak to 24 games. After Infante’s single, Bonifacio scored when Greg Dobbs grounded into a double play.
Later in the third, Morrison hit his 16th homer over the out-of-town scoreboard in left-center field, giving Florida a 4-0 lead.
Dobbs hit an 0-2 pitch into the National’s bullpen in left for a home run in the fifth inning to extend the lead to 5-0.
Nolasco, who allowed nine runs on nine hits in 1 1-3 innings his last time out against the Padres, held the Nationals hitless until Nix led off the fifth inning with his 13th home run of the season.
Washington added a run in the sixth on Michael Morse’s run-scoring double, which proved to be the Nationals final hit of the night.
Mike Dunn relieved Nolasco to get the final out of the sixth inning, Burke Badenhop threw two perfect innings, and Jose Ceda pitched the ninth.
Buck homered to lead off the ninth inning, the first of 10 batters Florida sent to the plate. Florida loaded the bases for Dobbs’ single. Mike Cameron also had a run-scoring single, and Hanley Ramirez drove in a run with a groundout.
NOTES: Florida 1B Gaby Sanchez was out of the starting lineup for the first time this season after he was scratched due to a tight left hamstring. Sanchez is day to day. ... The Nationals announced they had traded for Reds OF Jonny Gomes just before first pitch. The team sent two minor leaguers to Cincinnati in return for Gomes and cash considerations. ... Washington RHP Chien-Ming Wang is expected to start Friday, his first major league start since July 4, 2009. Nationals manager Davey Johnson said Wang, who has been recovering from his 2009 shoulder surgery, will be activated from the disabled list Friday. ... The combined age of Marlins manager Jack McKeon (80 years old) and Johnson (68) is 149 years and 57 days. That’s the oldest for any managing pair since 1950, according to information provided from the Nationals from the Elias Sports Bureau.