WASHINGTON -- Ryan Zimmerman keyed a six-run inning with a grand slam and Stephen Strasburg finally received some offensive support as the Washington Nationals erupted to beat the San Diego Padres 11-7 on Sunday to sweep the series and win their fourth straight.
Zimmerman broke a 1-1 tie with a grand slam to right on the first pitch from Robbie Erlin (1-2) in the third inning to make it 5-1. It was the 10th homer of the season for Zimmerman but just the second at home. He is 5-for-7 with 12 RBIs with the bases loaded this year.
Nationals rookie Anthony Rendon hit a two-run homer later in the inning to make it 7-1.
Washington (46-42) has won seven of 10 games for the first time since starting the year 7-3.
The Nationals added four runs in the fifth to make it 11-3 as Zimmerman walked and scored and Rendon drove in a run with a single.
An RBI groundout by San Diego's Will Venable cut the lead to 11-4 in the sixth and the Padres added two in the seventh to make it 11-6.
Carlos Quentin had an RBI single against reliever Craig Stammen in the eighth to make it 11-7. Drew Storen then came in to pitch for the Nationals and got out of the inning. Tyler Clippard pitched the ninth.
Strasburg (5-6), who is from San Diego, allowed four runs in six innings after he went nine starts in a row allowing two earned runs or fewer.
The Nationals scored just seven runs in Strasburg's previous five starts but found a lot of holes with hits through the infield against the Padres (40-49), who lost their ninth game in a row to end a disastrous road trip.
All-Star Bryce Harper, who had an RBI single in the first inning to make it 1-0, reached base in his first four at-bats with three singles and a walk and also had two steals. He lined out to center with the bases loaded to end the seventh in his fifth at-bat.
Alexi Amarista hit a two-run homer for the Padres in the fourth off Strasburg to cut Washington's lead to 7-3 after the fourth career grand slam by Zimmerman.
Chase Headley (three hits) had an RBI double in the third to tie the score at 1.
Erlin, in his fourth big league start, allowed nine runs in four innings.
Washington won just six of the first 16 games started by Strasburg despite an ERA of 2.24. The Nationals have scored 32 runs in the last four games.
NOTES: The Nationals placed LHP Ross Detwiler (2-7, 4.04) on the disabled list with a lower back strain. RHP Dan Haren is expected to come off the DL and start Monday in Philadelphia. ... INF Everth Cabrera was named to the National League All-Star team on Saturday, becoming the third Nicaraguan to be named. He joined pitchers Dennis Martinez and Vicente Padilla as players to make it from his country. ... C Rene Rivera was called up from Triple-A Tuscon and C Yasmani Grandal was put on the 60-day DL after he left the game on Saturday with a left knee injury when Rendon slid into him on a force play at the plate. ... The Nationals have not been four games above .500 since May 17 at 23-19. ... The Nationals are pushing Ian Desmond for the final NL All-Star roster spot. He began the day leading all MLB shortstops in extra-base hits, and 10 of his 15 homers have been go-ahead shots.