This Date In White Sox History - June 21stJune 21, 1956 - Jack Harshman tosses a one-hitter in the White Sox 1-0 victory over the Orioles. The opposing Baltimore hurlers,
Connie Johnson and
George Zuverink, also combined to yield only one hit to the Chicago batters in the Comiskey Park contest.
http://www.retrosheet.org/boxesetc/1956/B06210CHA1956.htm