On July 21, 1975 — Ted Simmons has a 4th-inning home run erased because his grooved bat is illegal. The Cardinals play the game under protest but beat the Padres anyway as rookie Eric Rasmussen wins his major league debut, 4 – 0.

 


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