On August 31, 1997 — In front of a crowd of 55,707, Don Mattingly’s uniform number 23 is added to the list of retired numbers on the wall at Monument Park. The former Bronx Bomber first baseman, who served as captain of the team from 1991 to 1995, is the first Yankee to have his uniform number retired without having reached a World Series.


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Sources:
Baseball Reference August 31
National Pastime August 31
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game