Nationals' manager Dave Martinez said Sunday that he's hopeful Adam Eaton (ankle) will return from the disabled list during the coming week.
Dexter Fowler reached base five times, notching a hit and drawing four walks, in a win over the Reds on Sunday.
Nationals recalled RHP Austin Adams from Triple-A Syracuse.
Nationals placed INF Anthony Rendon on the 10-day disabled list, retroactive to April 19, with a left toe injury.
Yoan Moncada went 1-for-3 in a loss to the Astros on Sunday.
Evan Gattis hit his first homer of the season on Sunday in a victory over the White Sox.
Reynaldo Lopez allowed one run over five innings in a no decision on Sunday against the Astros.
Lance McCullers gave up one run over six innings in a victory over the White Sox on Sunday.