"It's part of the season where you err on the side of caution. I didn't want to put myself in a position where I potentially get hurt," said Werth, who went 0-for-3 in the game. "I talked to [manager] Dusty [Baker], and he got me out of there. If I'm not in there, I'll be surprised. It's possible it could be tight tomorrow. I don't think we are dealing with anything other than tightness."
Werth has played in 143 games for Washington this season and is hitting .244 with 21 home runs and 69 RBIs.
Bill Ladson has covered the Nationals/Expos for MLB.com since 2002 and writes an MLBlog, All Nats All the Time. He also can be found on Twitter @WashingNats. This story was not subject to the approval of Major League Baseball or its clubs.