California’s Dave Winfield slugs the 400th home run of his career, becoming the 23rd player in history to reach the milestone, in a 7 – 4 win over the Minnesota Twins. The blow comes off Minnesota southpaw David West.

On August 14, 1991 — California’s Dave Winfield slugs the 400th home run of his career, becoming the 23rd player in history to reach the milestone, in a 7 – 4 win over the Minnesota Twins. The blow comes off Minnesota southpaw David West.

Source:
Baseball Reference August 14
National Pastime
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game