* Jim Edmonds
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.
In the 2009 MLB season, only Mariano Rivera of the New York Yankees wears #42.
Nobody baseball retired it.
Players that wear number 12 are players like Alfonso Soriano of the Chicago Cubs.
what team? many MLB team (players) have used the # 31