WASHINGTON -- Nationals right fielder Jayson Werth exited Saturday's 10-9 loss to the Cardinals prior to the ninth inning with a hamstring cramp.
With the score tied at 9 as the Nationals took the field, Eury Perez -- called up earlier in the day as rosters expanded to 40 players -- made his Major League debut in center field and Bryce Harper moved to right as Werth remained in the dugout.
Werth finished the game 1-for-5 with one run scored and two strikeouts, lowering his batting average to .313.
Perez never got to bat, though he did field a fly ball for the final out of the ninth.
"It just felt intelligent not to play any longer, so [manager Davey Johnson] took me out," Werth said. "It's been a long time since I've cramped up during a game, so hopefully it'll be nothing and I'll be back by [Sunday], but we'll see. I don't think it's too serious, though."
Werth added it's been "four or five years" since he's cramped up during a game, but Johnson confirmed the issue wasn't anything serious.
"He was cramping real bad," he said. "He didn't pull anything, so he should be OK."