On September 15, 2000 — On the day same day he and teammate brother Jeremy homer in the same game for the second time in their careers, the A’s first baseman Jason Giambi sets a team record by hitting his fourth grand slam of the season as Oakland drubs the Devil Rays, 17-3. The base-loaded shot also ties a major league record for the most grand slams by a team in a single season, 12.

Sources:
National Pastime

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