Werth had the day off Friday, and Williams thought Werth was going to play Saturday. Williams said Werth was "getting worked on right now."
"[Werth] has had a little bit of an issue with [the shoulder]. It has been sore on occasion," Williams said. "If he takes a funky swing or swings at a bad ball or something, then he gets sore again. He has been playing with it for a week and a half and he is playing pretty well, too."
Werth was not available for comment before the game.
Bill Ladson is a reporter for MLB.com and writes an MLBlog, All Nats All the time. He also could be found on Twitter @WashingNats. This story was not subject to the approval of Major League Baseball or its clubs.