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Jayson Werth was a late scratch from today's game due to severe migraines.
Werth said he felt fine when he woke up in his hotel room but was in considerable pain upon arriving at the ballpark about three hours before first pitch.
"When I told the doctor my symptoms, he said that it was a classic migraine," the veteran outfielder said. "It's surprising. I was fine when I woke up. As soon as I got here, I didn't feel so hot."
Werth did say he progressed somewhat as the day advanced, and by the seventh inning he was in uniform and in the dugout in case Johnson needed to use him as a pinch-hitter.
"I still didn't feel very good," he said. "In an emergency, I think I could have been used."
Werth said he assumes he'll be able to play Tuesday in the opener of a six-game homestand against the Diamondbacks and Phillies. A Nationals lineup that's already missing Ryan Zimmerman and Michael Morse (both on the disabled list) could sorely use Werth, who is batting .273 with a .378 on-base percentage and ranks second on the roster with two homers and nine RBI.
"The last thing I want to do right there is not be able to play," he said. "I was pretty much trying everything we could do. I couldn't overcome that. I've never had that before."