On August 19, 1970 — 1970 – Fergie Jenkins homers and his teammates add another six as Chicago coasts over San Diego, 12 – 2. Jim Hickman (2), Glenn Beckert, Johnny Callison, Joe Pepitone, and Billy Williams also hit round trippers for Chicago. Six of the Cub homers are solo shots and San Diego adds a solo homer: the seven solo homers by two teams sets a National League record and ties the major league mark set on April 29, 1962.
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Sources:
Baseball Reference August 19
National Pastime August 19
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game