The Giants beat the Mets, 2 – 1, but lose Jack Clark for a month after a Mark Bomback pitch breaks a bone in his left hand.

This Day In Baseball

On August 20, 1980 — The Giants beat the Mets, 2 – 1, but lose Jack Clark for a month after a Mark Bomback pitch breaks a bone in his left hand.

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Sources:
Baseball Reference August 20
National Pastime August 20
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game