"If that doesn't get better, then obviously it's not a good spot for him to be in," Johnson said. "But at one time he had a cannon, and we're all waiting for him to come back. I still think it's more mental, not just trusting it and cutting it loose. I see his work and he throws the ball pretty good, and then you see him having to play real shallow and almost cheating in, so it's not all together there yet is what I'm saying."
Johnson thought that Zimmerman would need until June to adjust his mechanics, but the Nationals' skipper is surprised that the issues still haven't been worked out.
"I knew it was going to take until June, but obviously it's taken longer," Johnson said. "It's more about him, if you see him throw early, he throws deeper and throws the ball on line. I don't know if it's physical or mental."
Tom Schad is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.