Nationals prospect Stephen Strasburg pitched five no-hit innings in his fourth professional start on Tuesday.
Strasburg also drove in the game's only run as the Double-A Harrisburg Senators blanked the Reading Phillies 1-0.
He retired the first 13 batters he faced in the opener of a doubleheader, striking out six.
Strasburg improved to 3-0 and lowered his ERA to 0.52.
Strasburg Throws Five No-Hit Innings