On August 29, 1981 — 1981 – Phillies farmhand Jeff Stone steals his 121st base of the season for Spartanburg (South Atlantic League), breaking the all-time professional record set last season by Alan Wiggins. Stone will finish the season with 122 stolen bases, a record that will not last through 1982.
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Sources:
Baseball Reference August 29
National Pastime August 29
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game