After the Nationals' half-inning ended, Escobar was taken out of the game. Danny Espinosa switched from second to third base, while Dan Uggla entered the game at second.
Manager Matt Williams said Escobar had preliminary X-rays taken and the results were negative.
"It's pretty swollen, so we'll see how he is tomorrow," Williams said.
Bill Ladson is a reporter for MLB.com and writes an MLBlog, All Nats All the Time. He also can be found on Twitter @WashingNats. This story was not subject to the approval of Major League Baseball or its clubs.