MLB commemorates Jackie Robinson Day every April 15th by having all players and coaches don the No. 42 jersey in honor of the Dodgers legend. Robinson broke MLB's color barrier in 1947 as the first Black player, facing racial discrimination but excelling on the field with accolades like Rookie of the Year and an MVP award.
In 1997, Robinson's No. 42 was universally retired across all 30 MLB teams, except for one day a year when players wear it to honor his legacy. The tradition started in 2004 with celebrations at 13 ballparks and expanded to include all teams the following year. The league's decision to allow players to wear No. 42 annually as a tribute to Robinson was influenced by Hall of Famer Ken Griffey Jr.'s request in 2007, leading to a league-wide initiative where all players, managers, and coaches now sport the iconic number on April 15.