Both Wes Westrum and Davey Williams of the Giants hit grand slams, as the Giants beat St. Louis, 14 – 4, at the Polo Grounds. The win moves New York into second place.

On July 13, 1951Both Wes Westrum and Davey Williams of the Giants hit grand slams, as the Giants beat St. Louis, 14 – 4, at the Polo Grounds. The win moves New York into second place.

Source
Baseball Reference July 13