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Seattle Mariners (1989–1999)

In 1990 and 1991, Griffey and his father became the first son and father to play on the same team at the same time. In his father'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, the pair hit back-to-back home runs in the top of the first off California Angels pitcher Kirk McCaskill, becoming the first father-son duo to hit back-to-back home runs. On September 21, Ken Griffey Jr. famously stole a fly ball off the bat of Sammy Sosa from his father, who was playing left field, for the third out of the inning. Then-twenty year old Griffey Jr. was subsequently grounded by his father in the dugout after the play for breaking the former's previously established "three square feet territory" in left field for fly balls and had his car keys confiscated. The duo played a total of 51 games together before Griffey Sr. retired in June 1991.