Nationals outfielder Bryce Harper was to move up a level Thursday night in his injury rehabilitation assignment, joining Double-A Harrisburg for a game at Bowie, Md.
Harper hasn't played for Washington since May 26 and was put on the disabled list June 2 with bursitis in his left knee.
Washington manager Davey Johnson said the plan is for Harper to play a full game.
"Hopefully the field is not going to be damp. I don't know what kind of field is at Bowie, but Potomac's is right at the bottom of a hill, and that field can retain water," Johnson said. "Ideally we'd like him to run around for eight or nine innings, see how the knee reacts to that."
In two games with Class-A Potomac, Harper went 2 for 4 with a double, home run, a walk and run over eight innings. He played three innings in left field on Tuesday and was the designated hitter Wednesday due to the possibility of rain.
Johnson hopes Harper can return to the Nationals for Monday's series opener against Milwaukee.
"I'd like to see him go nine innings, probably take tomorrow off, then go back and play again (Saturday)," Johnson said. "Just make sure that everything's going to stay calmed down."