Doug Fister delivered four scoreless innings in his minor league rehab debut Sunday afternoon with High-A Potomac and Nationals manager Matt Williams acknowledged to reporters Tuesday night that the right-hander is on track to join Washington’s starting rotation after just one more rehab outing.

That sets up Fister’s debut in a Nationals uniform, according to beat writer Adam Kilgore of the Washington Post, for May 7 against the Dodgers.