Manager Jim Riggleman was in attendance and said Zimmermann threw the ball well despite what the stats say.
"I talked to him after the game. He said he really felt good," Riggleman said. "My concern [was] that he felt good. His arm feels good. His delivery looked real good. He didn't get the results yesterday. I know I was encouraged by how his arm felt."
Zimmermann's next start will be in Harrisburg. The Nats are hoping that Zimmermann can return to the Major Leagues sometime in August.