Batting third and playing right field, Werth popped up to second base in the first inning and notched an RBI single in the second. He struck out swinging in the fourth before working a walk and scoring a run in the sixth.
The 33-year-old outfielder was initially slated to begin his rehab assignment on Friday, but inclement weather at Potomac pushed it back a day.
Werth broke the wrist diving for a ball in Philadelphia on May 6. Since the injury, he has been targeting a return date in early August. In 27 games with the Nats, Werth batted .276 with three home runs.