Presented by ALPHAGRAPHICS. This Day In Sports…November 21, 1969: The birthday of the most popular Seattle Mariner of all-time (or,at least he’s tied with Ichiro). Ken Griffey Jr. made his Mariners debut in 1989 as a 19-year-old phenom, and played 51 games alongside his dad, Ken Griffey Sr., the following two seasons. His major league…… MORE