WASHINGTON -- Nationals left fielder Jayson Werth left Friday's 7-4 loss to the Marlins in the seventh inning because of back tightness. He is listed as day to day, and the injury is not considered serious.
Once he went into the locker room, Werth did some muscle tests with the trainers, and they ruled out any strains or muscle pulls in the back.
"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.