Yadier Molina went 3-for-4 with an RBI and two runs scored as the Cardinals completed a three-game sweep of the Reds with Sunday's 9-2 win.
Paul DeJong went 2-for-5 with a three-run home run in Sunday's win over the Reds.
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.