Cardinal Mark McGwire becomes the first major leaguer to hit 20 home runs for two different teams in the same season. ‘Big Mac’ had hit 34 with the A’s before being traded to St. Louis.

On September 20, 1997 — Cardinal Mark McGwire becomes the first major leaguer to hit 20 home runs for two different teams in the same season. ‘Big Mac’ had hit 34 with the A’s before being traded to St. Louis.

 


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