Braves slugger Eddie Mathews hits the first grand slam in the history of the Milwaukee franchise, as the Braves sweep two from the Cardinals, 10 – 1 and 4 – 3, in St. Louis.

On July 12, 1953Braves slugger Eddie Mathews hits the first grand slam in the history of the Milwaukee franchise, as the Braves sweep two from the Cardinals, 10 – 1 and 4 – 3, in St. Louis.

Source
Baseball Reference July 12