On September 23, 1997 — The Mariners break the record for most home run by a major league team when Jay Buhner goes deep for the club’s 258th round-tripper of the season in the first inning of the 4-3 victory over Anaheim at the Kingdome. The eventual AL Division Champs, who will have six players hit at least 20 homers, break the record established last year by the Orioles, and will extend the mark to 264 round-trippers by season’s end.

 


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Sources:
Baseball Reference September 23
National Pastime September 23
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game