Dozens of father-and-son combinations have played or managed in Major League Baseball (MLB). The first was Jack Doscher, son of Herm Doscher, who made his debut in 1903. Ken Griffey Sr. and Ken Griffey Jr. became the first father-and-son duo to play in MLB at the same time, in 1989 when Ken Jr. was called up by the Seattle Mariners while Ken Sr. was playing with the Cincinnati Reds. They became Mariner teammates in 1990. In Ken Sr.'s first game as a Mariner, on August 31, 1990, the pair hit back-to-back singles in the first inning and both scored. On September 14, in the top of the first off California Angels pitcher Kirk McCaskill, the pair hit back-to-back home runs, the only father-son duo to do so. They played 51 games together before Ken Sr. retired in June 1991.