Dave Henderson is one of the voices of the Mariners. Henderson brings 27 years of professional baseball experience to the booth, including 14 years of Major League playing experience. Henderson began his playing career in the Mariners organization after being drafted in the first round (26th overall) in the 1977 June draft. Hendu was a member of the A's 1989 World Series Championship team and was an All-Star in 1991. He owns a .324 average in 20 World Series games.