Jayson Werth will miss tonight’s game — or at least he won’t be starting — after getting hit by an Aaron Heilman fastball in the left elbow last night in the nine inning. Werth remained in the game, but after getting treatment the Nationals held him out today. Laynce Nix is in right field, batting third.

Nationals

1. Roger Bernadina, LF

2. Ian Desmond, SS

3. Laynce Nix, RF

4. Michael Morse, 1B

5. Danny Espinosa, 2B

6. Rick Ankiel, CF

7. Ivan Rodriguez, C

8. Jerry Hairston, 3B

9. Yunesky Maya, 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. Xavier Nady, 1B

8. Gerardo Parra, LF

9. Josh Collmenter, SP