On September 30, 1910 — In a shootout at the Polo Grounds, Beals Becker hits a pinch inside-the-park grand slam as the Giants outslug Brooklyn, 17 – 8. It is the second such pinch slam in ML history; Mike O’Neill hit the first.
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Sources:
Baseball Reference September 30
National Pastime September 29
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game