Injury updates on Bryce Harper, Denard Span, Yunel Escobar, Anthony Rendon, Ryan Zimmerman and the rest.
Escobar left Friday night's game after being hit in the hand with a pitch, and Span was a late scratch with back spasms.
The top of the Nationals order is starting to look like itself again, and that will help the offense.
"Just kind of hang out and do nothing. It's pretty brutal, actually," Zimmerman said.
"Hopefully just take it day-by-day right now," he said.
Espinosa had never played the outfield in his professional career until Sunday.
The Nationals pushed the issue Thursday night, and may begin to do so more frequently.
The Nationals center fielder hopes tomorrow is the day his right knee feels good enough to let him return to the lineup.
Fister and Solis threw their first bullpen sessions, and Rendon is slated to return to Harrisburg on Tuesday.
The Nationals center fielder and leadoff man left Sunday's game after his right patella tendon, injured in Chicago, flared up.