Question: what is the significance of the number 42 in baseball?
Answer: Upon the 50th anniversary of Robinson's debut in 1997, the MLB retired his No. 42 league-wide, meaning no new players would be issued the number around the league in Robinson's honor. Yankees pitcher Mariano Rivera, who made his MLB debut in 1995, was the final player to wear No. 42 upon his retirement in 2013.