But the right-hander said after the game that the procedure and subsequent wound on his neck did not influence his performance, and he's "good" moving forward.
"It had no effect tonight," Fister said.
Bill Ladson is a reporter for MLB.com and writes an MLBlog, All Nats All the time. He also could be found on Twitter @WashingNats. Daniel Popper is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.