On September 23, 2001 â At Camden Yards, Yankee closer Mariano Rivera establishes a franchise single-season record when he saves his 47th game, a 5-4 victory over Baltimore in 10-innings. The previous record was held by Dave Righetti, who set the mark in 1986.
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Sources:
Baseball Reference September 23
National Pastime September 23
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game