Manager Jim Riggleman, as he said he would try to do, is cycling Roger Bernadina, Rick Ankiel and Laynce Nix in center and left. Today, he’s got Ankiel in center and Bernadina in left, with Nix, who has homered in three of his last four starts, on the bench. Against a left-hander, Zach Duke, perhaps Riggleman is choosing his best defensive outfield. Also, for the second straight game against a lefty, Danny Espinosa will bat fifth.

Nationals

1. Roger Bernadina, CF

2. Ian Desmond, SS

3. Jayson Werth, RF

4. Michael Morse, 1B

5. Danny Espinosa, 2B

6. Wilson Ramos, C

7. Rick Ankiel, CF

8. Jerry Hairston, 3B

9. Jordan Zimmermann, SP

Diamondbacks

1. Ryan Roberts, 3B

2. Kelly Johnson, 2B

3. Justin Upton, RF

4. Stephen Drew, SS

5. Chris Young, CF

6. Miguel Montero, C

7. Juan Miranda, 1B

8. Gerrardo Parra, LF

9. Zach Duke, SP