On August 21, 1968 — Minnesota’s Jim Merritt loses his shutout in the 9th when Mickey Mantle hits a pinch homer, but he wins 3 – 1. It is Mantle’s 534th home run, tying him with Jimmie Foxx for 3rd on the all-time list.
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Sources:
Baseball Reference August 21
National Pastime August 20
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game