(LARRY DOWNING/REUTERS)

Harper will also play left field, while Rick Ankiel returns to center. Right hander Ian Kennedy (3-0, 3.38 ERA) takes the mound for the Diamondbacks.

UPDATE: Adam LaRoche was scratched from the lineup with right oblique soreness. Werth will bat fourth and Chad Tracy will start at first base and hit fifth.

Nationals:

1) Ian Desmond, SS

2) Steve Lombardozzi, 3B

3) Bryce Harper, LF

4) Jayson Werth, RF

5)Chad Tracy, 1B

6) Danny Espinosa, 2B

7) Rick Ankiel, CF

8) Wilson Ramos, C

9) Ross Detwiler, SP