On August 15, 1955 — Mickey Mantle homers from both sides of the plate in the same game for the second time in his career, tying the major-league mark. The Yanks beat the Orioles, 12 – 6, in the second game and sweep the doubleheader to move back into first place.

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Source:
Baseball Reference August 15
National Pastime
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game