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Bill Mazeroski’s uniform jersey #9 is officially retired from active service by the Pirates. The 1960 World Series hero joins Billy Meyer (1), Willie Stargell (8), Pie Traynor (20), Roberto Clemente (21), Honus Wagner (33), and Danny Murtaugh (40) to be honored by Pittsburgh in this manner.

This Day In Baseball, Uniforms

On August 7, 1987 — Bill Mazeroski’s uniform jersey #9 is officially retired from active service by the Pirates. The 1960 World Series hero joins Billy Meyer (1), Willie Stargell (8), Pie Traynor (20), Roberto Clemente (21), Honus Wagner (33), and Danny Murtaugh (40) to be honored by Pittsburgh in this manner.

Source:
Baseball Reference August 7
National Pastime
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game