Right-hander Dan Haren will open the series against the Pirates on Monday, while the Nationals are hoping that left-hander Ross Detwiler will start the second game of the set on Tuesday. Detwiler is on the disabled list because of back issues. He may have to do a rehab assignment before he returns to the Major League staff. If Detwiler is not ready, right-hander Taylor Jordan will make the start.
Detwiler had a cortisone shot recently to get rid of the pain in his back, according to Johnson.