Barrett did not get an MRI on the knee. All he did was put ice on it. The injury is nothing new to Barrett. It happened while he was pitching for Double-A Harrisburg last year.
"[The trainers] say when I pushed off the mound, my knee hyperextended," Barrett said. "… I felt sharp pain. After two more pitches, I really didn't feel it. I just tweaked it a little bit. It should be fine."
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.