Nationals manager Davey Johnson believes prospect Bryce Harper probably will miss the rest of the minor league season. Harper was evaluated by a doctor Friday after he was injured during Double-A Harrisburg's game at Akron on Thursday. The examination confirmed the 18-year-old has a strained right hamstring. "I'm not going to worry a whole lot about Bryce Harper getting hit with a slight pulled hammy," Johnson said. "He probably won't play the rest of the year, as far as I know. There's only a few games left. No sense in taking a chance and aggravating it where it becomes more of a serious injury." Harrisburg's regular season ends Sept. 5.