On September 19, 1982 — Mariners rookie Orlando Mercado becomes the third player to hit a grand slam for his first major league hit. Bill Duggleby (1898 – first at-bat) and Bobby Bonds (1968 – third at-bat) were the other two players to accomplish the feat.

 


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Sources:
Baseball Reference September 19
National Pastime September 19
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game