W: Rafael Soriano (3-1) L: Evan Marshall (4-3)
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | R | H | E | |
| Diamondbacks | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 0 | 2 | 7 | 0 |
| Nationals | 0 | 1 | 0 | 0 | 0 | 1 | 0 | 0 | 1 | 3 | 9 | 0 |
Walk-offs are fun, if you are the team that is doing the walking off. Unfortunately for the Arizona Diamondbacks, they have been on the wrong end of yet another walk-off. The Washington Nationals beat the D-backs 3-2 in walk-off fashion for the second time in three games, running their winning streak to nine games.
Anthony Rendon hit a game-winning RBI single that scored Bryce Harper against Evan Marshall. The D-backs had just tied the game in the eighth inning with Ender Inciarte's two run homer off Tyler Clippard.
Trevor Cahill had another quality outing in what turned out to be a no decision, pitching 6 1/3 innings allowing two earned runs on six hits, five walks and five strikeouts. Tanner Roark was left hanging after a fantastic start, throwing seven scoreless innings of five hit ball.
The series finale will be played on Thursday afternoon, as two lefties will battle in Wade Miley and Gio Gonzalez.