April 10, 2000: Ken Griffey Jr. becomes youngest player to hit 400
Ken Griffey JR. Final Answer 7 0f 10 2000 Fleer Showcase #7 PSA 9 Reds
Ken Griffey Jr.: A chronicle of Junior's time with the Reds - Sports Illustrated Vault
Ken Griffey Jr. hits 400th career home run
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April 10, 2000: Ken Griffey Jr. becomes youngest player to hit 400 home runs – Society for American Baseball Research
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Ken Griffey, Jr. hits his 300th career home run to become the second-youngest player to reach the milestone - This Day In Baseball
Ken Griffey Jr., the youngest player in the majors, hits his first career homer on the first pitch he ever sees at his home ballpark, the Kingdome. - This Day In Baseball
Mike Piazza - This Day In Baseball
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Timeline: Career highlights of Ken Griffey Jr. - Sportspress Northwest
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