Professional baseball has been played in America since 1875, but on September 14, 1990, something happened that has never happened before or since. Late in his career, Ken Griffey, Sr., who had been a key member of the World Series champion Cincinnati Reds years before, was signed by the Seattle Mariners. His son Ken Griffey, Jr. was just starting his major league career. In the first inning of a game against the Angels, Griffey, Sr. hit a home run to left center field. His son followed him to the plate and hit another home run to almost exactly the same spot.