Adam LaRoche hit a game-winning solo home run with two outs in the 11th inning to help the Washington Nationals beat the Arizona Diamondbacks 5-4 Monday night for their seventh straight win.
It was the third walk-off win in as many days for NL-East leading Washington.
LaRoche sent a 3-1 pitch from Will Harris (0-3) off the wall in the back of the Nationals bullpen and was mobbed by his teammates at home plate.
Winning pitcher Craig Stammen (3-4) pitched out of a bases-loaded, no outs jam in the top of the inning.
Arizona tied it 4-4 when David Peralta led off the ninth with a solo homer off Tyler Clippard.
Washington trailed 3-2 when Denard Span doubled with one-out in the eighth against Brad Ziegler and Anthony Rendon followed with a triple to tie it. Jayson Werth then scored Rendon with a sacrifice fly.
Miguel Montero had three hits for Arizona, Rookie Ender Inciarte extended his hitting streak to 18 games.
Arizona had taken the lead in the top of the eighth.
Jake Lamb drew a lead-off walk off Jordan Zimmermann, and Didi Gregorius sent a 3-2 fastball into the Nationals bullpen for his fifth home run.
Wilson Ramos had given Washington a 2-1 lead with a two-run homer off Arizona starter Vidal Nuno in the seventh.
Nuno, winless in eight starts with the Diamondbacks, pitched well, allowing two runs and five hits over seven innings.
Zimmermann went seven-plus innings, allowing three runs on four hits. His three walks were a season-high.
He faced the minimum through four innings thanks to a pair of double plays.
In the fifth however, the first two Diamondbacks reached base via a walk and a single. Manager Kirk Gibson had No. 6 hitter Jordan Pacheco bunt the runners over, and Lamb's sacrifice fly made it 1-0.
Diamondbacks: SS Chris Owings, on this disabled list with a strained left shoulder, began a rehab assignment Sunday with the team's Arizona Rookie League affiliate, going 2 for 3.
Nationals: Werth (sore shoulder) was in the starting lineup for the first time since Aug. 10. . OF Nate McLouth, out since Aug. 2 with right shoulder inflammation, was scheduled to undergo an Arthrogram -- an MRI procedure that involves dye being injected into the joint -- on Monday to help determine the extent of his injury.