Upton iced the elbow a couple of times before going to bed Tuesday, and woke up feeling much better.
"I'm just a little sore, and I can play if I'm sore," he said.
Upton was clearly unhappy after being hit. It was the fifth time this year he was plunked by a Nats pitcher, and he slammed his bat down in disgust.
"I was a little upset about it," Upton said. "My thing is, man, control your pitches. I don't know if you were trying to hit me or not, but control your pitches. Obviously, I know what their plan is, they're going to try to come inside. So be it."
Nationals manager Davey Johnson took issue with Upton for his reaction.
"Upton covers the outside corner well, and if you throw him a couple of pitches out there, you're going to come in on him," Johnson said. "He kind of dives into it and leans into it, and it's the same thing with a couple of my hitters. You try to pitch them in. We've gotten hit more than most. I thought Upton reacted rather poorly. I think Upton overreacted to that."