Why are Boston Red Sox players all wearing No. 42 jerseys? Jackie

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Jackie Robinson Day, when MLB players can wear No. 42

Major League Baseball honored Jackie Robinson with players, coaches and umpires all wearing Robinson's uniform number, 42. Here, Boston Red Sox first baseman Kevin Youkilis, left, mans the bag along with Minnesota

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Number 42 - jersey number of Jackie Robinson - the only number to be retired across all MLB, at Boston Red Sox training facilility, Ft Myers, Florida Stock Photo - Alamy

Dodgers gather at Jackie Robinson statue to pay respects

The Only Day MLB Players Can Wear No. 42 » Britannica

It's a huge privilege' to wear Jackie Robinson's No. 42