- On September 14, 1990, Ken Griffey Sr. and Ken Griffey Jr., playing for the Seattle Mariners, hit back-to-back home runs, becoming the only father-son duo to hit back-to-back home runs and home runs in the same game.
- He and his father are one of two father-son duos to play on the same team in the same game. The other is Tim Raines, and Tim Raines Jr.
- Father, Ken Griffey Sr., was a pivotal player for Cincinnati's "Big Red Machine" during the 1970s.
- Demands trade from the Seattle Mariners, saying he wants to play somewhere closer to his family. (November 1999).
- Professional baseball player
- Traded on 10 February 2000 to the Cincinnati Reds for OF Mike Cameron, Brett Tomko, and two minor league players.
- #1 overall pick in the June 1987 draft out of Moeller H.S. (Cincinnati, Ohio) by the Seattle Mariners.
- Recorded "The Way I Swing" with Kid Sensation.
- Son George Kenneth III "Trey" (19 January 1994), daughter Taryn Kennedy (21 October 1995), adopted son Tevin Kendall (5 May 2002). When Trey was born, then-Mariners' G.M. Woody Woodward sent him a player's contract dated 2012.
- He and his father are the only father-son duo to hit home runs in the same game.
- Seattle Mariners All-Time Homerun Leader (398) and All-Time Leader in Slugging Percentage (.569).
- Seattle Mariners All-Time Leader in Slugging Percentage(.569).
- Member of 1995 and 1997 American League Western Division Champion Seattle Mariners team.
- 1992 All Star Game MVP.
- 1997 American League MVP. Led league in Slugging Percentage (.646), Runs (125), Total Bases (393), Home Runs (56), RBI (147) and Extra-Base Hits (93).
- Seattle Mariners All-Time Leader in Grand Slams (12).
- Holds Seattle Mariners record for home runs in a month (15 in May 1994).
- Holds Seattle Mariners single season record for home runs on road (29 in 1997).
- Holds Seattle Mariners single season record for home runs at home field (30 in 1998).
- Holds Seattle Mariners single season record for home runs by lefthander (56 in 1997 and 1998).
- Seattle Mariners All-Time Home Run Leader by a lefthander (398).
- Holds Seattle Mariners single season record for most Extra-Base Hits (93 in 1997).
- Holds Seattle Mariners single season record for most RBI (147 in 1997).
- Holds Seattle Mariners single season record for most Total Bases (393 in 1997).
- Holds Seattle Mariners single season record for Slugging Percentage (.674 in 1994).
- Seattle Mariners All-Time Home Run Leader (398).
- Made major league debut on 3 April 1989.
- Named to Baseball Digest magazine's 1989 Rookie All-Star Team.
- Pacific Trading Cards manufactured a milk chocolate candy bar in honor of Jr's rookie debut in 1989, called the Ken Griffey Jr. bar.
- Made his professional baseball debut with the Bellingham (Washington) "Baby" Mariners of the Northwest League in 1987.
- Shares first and last names with another "Ken Griffey". Dealer of used cars in the Clarksville and Nashville, Tennessee areas, no relation.
- Center fielder with the Seattle Mariners (1989-1999; 2009-2010), Cincinnati Reds (2000-2008[start]) and Chicago White Sox (2008[end]).
- (July 31) Traded to the Chicago White Sox. (2008)
- The Seattle Mariners announced that he will return to the team, and will sign a 1 year contract worth $2 million, plus incentives. (February 2009)
- Inducted into the National Baseball Hall of Fame in 2016, with a record 99.32% of the vote. The previous record was Tom Seaver's 98.84% in 1992.
- Elected to the National Baseball Hall of Fame in his first year of eligibility with a record 99.3% of the votes. Griffey is the first #1 overall draft pick be elected. [January 6, 2016].
- Shares his birthday and birthplace with Stan Musial. His paternal grandfather was a high school teammate of Musial.
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