With MLB celebrating Jackie Robinson Day on April 15 and players across baseball wearing 42 during games on that day, much of the celebration could be credited to Ken Griffey Jr. requesting to ...

Ken Griffey Jr. came up with the idea of wearing No. 42 on April 15th. On the first Jackie Robinson Day when the number was worn league-wide (2009), Junior hit his 400th homer as a Mariner.

What's become a somewhat common, non-numbered parallel, this X-Fractor of Ken Griffey Jr. in 2004 was numbered to 172. Portrayed in his visitor's, sleeveless uniform, the X-Fractor has the famous ...

Griffey Jr. doesn't take credit for players league-wide wearing No. 42. But whether he does or doesn't, it's one of the most iconic tributes to the legendary figure.