As the Nationals play their first home game following a 10-game road trip, Denard Span returns to the lineup after sitting out Sunday's game with a tight back.
Span will also be looking to get on track, as the Nats center fielder has gone 0-for-18 over his last five games.
Tanner Roark will be on the mound opposite Astros left-hander Dallas Keuchel, who is 6-1 with a 1.33 ERA over his last seven starts. Roark is seeking his sixth straight quality start and has a 1.93 ERA over his last seven starts.
For the Nationals
CF Denard Span
3B Anthony Rendon
RF Jayson Werth
1B Adam LaRoche
LF Ryan Zimmerman
SS Ian Desmond
2B Danny Espinosa
C Jose Lobaton
RHP Tanner Roark
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