The Pirates outslug the Phillies, 15 – 9, at the Baker Bowl. Pittsburgh hits five homers; the Phils, four, with one home run coming in each inning, a virtually insurmountable record.

On July 10, 1929 The Pirates outslug the Phillies, 15 – 9, at the Baker Bowl. Pittsburgh hits five homers; the Phils, four, with one home run coming in each inning, a virtually insurmountable record.

Source

Baseball Reference July 10