Randall David Johnson, nicknamed "The Big Unit", is an American former professional baseball pitcher who played 22 seasons in Major League Baseball (MLB), from 1988 to 2009, for six teams, primarily the Seattle Mariners and Arizona Diamondbacks. His 303 career victories are the fifth-most by a left-hander in MLB history, while his 4,875 strikeouts place him second all time behind Nolan Ryan and first among left-handers. He holds five of the seven highest single-season strikeout totals by a left-hander in modern history. Johnson was a ten-time All-Star, won the Cy Young Award five times, and is one of only two pitchers to win the award in four consecutive seasons (1999–2002). In 1999, he joined Pedro Martínez and Gaylord Perry in the rare feat of winning the award in both the American and National Leagues. He is also one of five pitchers to pitch no-hitters in both leagues. On May 18, 2004, at the age of 40, Johnson became the oldest pitcher in major league history to throw a perfect game; he is one of seven pitchers to have thrown a perfect game and at least one other no-hitter in their careers. He is also one of 18 pitchers in history to record a win against all 30 MLB franchises. On May 8, 2001, Johnson achieved the feat of striking out 20 batters in a game, against the Cincinnati Reds.