All-star pitcher Johnson retires after 22 seasons

The Big Unit calls it a day after a 'whirlwind' career with six teams

SAN FRANCISCO: Randy Johnson looked so awkward on the mound early in his career, that shaggy hair dangling down his neck as he fired a blazing fastball in every direction but the strike zone.

Now, after 22 major league seasons, The Big Unit is walking away from baseball as one of the game's greatest pitchers.