On September 14, 1991 — Mariano Duncan, Hal Morris, and Paul O’Neill hit back-to-back-to-back home runs off Astros hurler Mark Portugal for the Reds. The homers account for the only Cincinnati runs in a 7 – 3 loss.

 


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Sources:
Baseball Reference September 14
National Pastime
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game