Every player in Major League Baseball wears number 42 today on Jackie Robinson Day, in honor of the anniversary of Jackie Robinson breaking the color line. The practice will be repeated in future years.

On April 15, 2009 – – Every player in Major League Baseball wears number 42 today on Jackie Robinson Day, in honor of the anniversary of Jackie Robinson breaking the color line. The practice will be repeated in future years.

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Baseball Reference April 15

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