"I was behind in the count," Zimmermann said. "I wasn't able to throw first-pitch strikes too often. I have [to pitch ahead] during the year, too. I guess it's good to get some work in."
Manager Matt Williams said that Zimmermann is being considered as the Opening Day starter against the Mets on March 31 at Citi Field. Stephen Strasburg is another likely candidate. Williams most likely will not make the decision until after the off-day on March 18.
"[Zimmermann] won a bunch of games [last season] -- 19 of them, I think," Williams 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. This story was not subject to the approval of Major League Baseball or its clubs.