1930 – Four pinch-hit home runs are hit in a doubleheader between Brooklyn and St. Louis. Hal Lee and Harvey Hendrick connect for Brooklyn, and George Puccinelli and Jim Bottomley, for the Cards. The homers are the first major-league hits for both Lee and Puccinelli.

On July 21, 1930 — 1930 – Four pinch-hit home runs are hit in a doubleheader between Brooklyn and St. Louis. Hal Lee and Harvey Hendrick connect for Brooklyn, and George Puccinelli and Jim Bottomley, for the Cards. The homers are the first major-league hits for both Lee and Puccinelli.

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Sources:
Baseball Reference July 21
National Pastime July 21
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game