Randall David Johnson (born September 10, 1963), nicknamed "The Big Unit", is a former Major League Baseball left-handed pitcher. During a 22-year career, he pitched for six different teams.
The 6-foot-10-inch (2.08 m) Johnson was celebrated for having one of the most dominant fastballs in the game. He regularly approached, and occasionally exceeded, 100 miles per hour (160 km/h) during his prime. He also threw a hard, biting slider. Johnson won the Cy Young Award five times, second only to Roger Clemens' seven.
Johnson finished his career first in strikeouts per nine innings pitched among starting pitchers (10.67), second all-time in total strikeouts (4,875; first among left-handed pitchers), third in hit batsmen (188), tenth in hits allowed per nine innings pitched (7.24), 22nd in wins (303), and 57th in shutouts (37). He pitched two no-hitters, the second of which was the 17th perfect game in baseball history.