On June 20, 2004 — On Father’s Day with his dad in attendance, 34 year-old Ken Griffey, Jr. blasts a sixth-inning Matt Morris fastball over the right-field wall at Busch Stadium for his 500th career home run. The Reds’ center fielder becomes the twentieth major leaguer, and the sixth youngest, to reach the milestone.

Sources:
National Pastime

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