Nationals right fielder Jayson Werth says he hopes to play Tuesday, but that will depend on how his ankle feels in the morning.
Matt Williams wants to play the matchups and the hot hand, and it could be Danny Espinosa, Kevin Frandsen or Zach Walters at second.
Jordan Zimmermann vs. Nathan Eovaldi.
The Nationals have yet to share a timetable for Ryan Zimmerman's return and say he continues to rest his strained hamstring.
The South Atlantic League named Nats top prospect Lucas Giolito its pitcher of the week for the second time this season.
Danny Espinosa is starting at second base again against a right-handed pitcher.
As the trade deadline nears, some notes on what the Nationals are up to.
With Lobaton behind the plate this season, Fister is 7-0 with a 1.82 ERA in eight starts.
The veteran becomes the 46th reliever to reach that career milestone.
Over the past seven weeks, the Nationals lead the majors in fielding percentage.