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One April 15, all players, coaches, and umpires of the MLB wear the jersey number 42 in honor of Jackie Robinson, the first African American MLB player, who played his first MLB game on April 15, 1947.
April 15, 1997
it was Jackie Robinson day
On April 15, 1997, Major League Baseball celebrated the 50th anniversary of Robinson's breaking the color barrier in the big leagues. At a ceremony held at Shea Stadium, it was announced that Robinson's jersey number would be retired by all 30 teams.Some players who wore No. 42 at the time, including Mo Vaughn of the Boston Red Sox, were allowed to continue wearing it until they retired. In 2010, relief pitcher Mariano Rivera of the New York Yankees was the only remaining major leaguer to wear it full time.In 2009, MLB began the practice of requiring all players, managers, coaches and umpires to wear No. 42 on April 15 in honor of Robinson.In 1997.
No player for the Detroit Tigers wore #42 during the 2007 season. Major League Baseball retired the #42 in 1997. Currently, Mariano Rivera is the last player using the number.