Some teams are wearing a black "34" patch to honor Nick Adenhart, the Angels rookie starting pitcher who was killed in a DUI hit-and-run following his first start of the 2009 season. A black patch with his name and number (34) was added above the left breast of the Angels' teams uniform, and in respect, some players who knew him or played with him are also wearing it.
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.
billy conigliaro
Mark Teixeira
Pablo Sandoval
Nick Swisher
Baseball players are wearing the number 42 today to honor and commemorate Jackie Robinson, the first African American player in Major League Baseball who broke the color barrier on April 15, 1947. This day is celebrated as Jackie Robinson Day in MLB to recognize his contributions to the sport and his impact on civil rights.
Alex Rodriguez
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They have a large Twitter following, are born in California, and pitch terribly in the playoffs.
Players that wear number 12 are players like Alfonso Soriano of the Chicago Cubs.
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Nobody baseball retired it.