Gary Cameron / Reuters

It is possible not only for the Nationals to clinch the NL East during their series in Philadelphia, but also to mathematically eliminate the Phillies from the wild-card race. They’ll start tonight behind left-hander Ross Detwiler.

Nationals

1. Jayson Werth, RF

2. Bryce Harper, CF

3. Ryan Zimmerman, 3b

4. Adam LaRoche, 1B

5. Michael Morse, LF

6. Ian Desmond, SS

7. Danny Espinosa, 2B

8. Kurt Suzuki, C

9. Ross Detwiler, SP

Phillies

1. Jimmy Rollins, SS

2. John Mayberry, CF

3. Chase Utley, 2B

4. Ryan Howard, 1B

5. Carlos Ruiz, C

6. Domonic Brown, RF

7. Darin Ruf, LF

8. Kevin Frandsen, 3B

9. Cole Hamels, SP