On September 7, 1997 — For only the twenty-second time in major league history, a player reaches the 50 home run plateau when Mariner outfielder Ken Griffey, Jr. goes deep off Bob Tewksbury in a 9-6 loss to Minnesota at the Metrodome. Junior will finish the season with a league-leading 56 round-trippers.
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Sources:
Baseball Reference September 7
National Pastime
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game