Why are MLB players wearing No. 42 jerseys today?

Players wear No. 42 on their jerseys in honor of Jackie Robinson Day during a baseball game between the Philadelphia Phillies and the New York Mets, Monday, April 15, 2019, in Philadelphia. (

Jackie Robinson Day: The only time MLB players can wear No. 42

Jackie Robinson Day Museum of the City of New York

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

MLB on X: Honoring No. 42. #Jackie42 / X

All players wearing 42 wrong way to honor Jackie

Seattle Mariners players honor Jackie Robinson by wearing the number 42 on their jerseys, as they stand for the national anthem before a baseball game against the Los Angeles Angels in Anaheim

Cincinnati Reds on X: Let's take a look at the 2018 holiday and special event #RedsThreads! We'll start with Jackie Robinson Day on April 15 vs. STL, the 71st anniversary of Robinson

All of MLB to wear Jackie Robinson's No. 42 in Dodger Blue on April 15 - ESPN

Puerto Rican Twins don No. 21 in tribute to Roberto Clemente – Twin Cities

Philadelphia apologizes for 'tremendous racism' against Jackie Robinson - The Globe and Mail

42 facts about Jackie Robinson to celebrate the 75th anniversary of his breaking the color barrier

Jackie Robinson - Wikipedia

The only day MLB players can wear No. 42? Jackie Robinson Day

Angels and Mariners lock arms in show of support on Jackie Robinson Day – Orange County Register