On August 29, 1998 — The Reds defeat the Marlins, 7 – 5, for Florida’s 89th loss of the season. Florida thereby sets a record for the most losses by a defending world champion. The old record of 88 was held by the 1991 Reds.
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Sources:
Baseball Reference August 29
National Pastime August 29
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game