On May 7, 1959, Stan "The Man" Musial knocked his 400th ball out of the yard. The historic home run not only made Musial the sixth player to reach the plateau, it also won the game as it came in the form of a walkoff blast that propelled the Cardinals to a 4-3 victory over the Chicago Cubs at Busch Stadium.
Musial had 75 more home runs left in his bat before his career came to a close. 252 of his 475 home runs came in St. Louis. He victimized the Giants more than any other ballclub by knocking 89 balls out of the yard while facing them. The team that helped provide Stan with his nickname, the Dodgers followed with 74, then came those baby bears from Chicago's North side. Cubs outfielders turned their heads and watch the ball fly over the wall 67 times when Stan swung that bat, which included that big blast on this day in '59.
Stats of a legend: http://www.baseball-reference.com/players/m/musiast01.shtml
Check out the historic box score here: http://www.baseball-reference.com/boxes/SLN/SLN195905070.shtml