Harper (knee) is not in the Nationals' lineup Tuesday against Philadelphia, Mark Zuckerman of MASN reports.
Harper took a pitch off of his right knee Monday and exited the game with what the team would later diagnose as a contusion. While Harper is not expected to miss significant time, he'll sit Tuesday as the Nationals attempt to avoid turning a minor injury into something that could linger. Washington will go with an outfield of Clint Robinson, Ben Revere and Jayson Werth on Tuesday.