Davey Johnson said on Monday relief pitcher Ryan Mattheus has aggravated a foot injury and will be evaluated by a specialist in Baltimore.
After an emotionally charged series that featured Cole Hamels intentionally plunking Bryce Harper, the Nationals expect a raucous environment at Citizens Bank Park tonight.
The Nats phenom made a big mistake in the second inning but rebounded to have perhaps his best game as a big leaguer.
He struck out eight. He hit his first career homer. He may have been dealing with an arm issue. Through it all, Nationals ace Stephen Strasburg maintained his unflappable demeanor.