Leaving Robison Field in mid-season, the Cardinals make their debut as the home team at Sportsman’s Park, also the home of the American League’s St. Louis Browns, bowing to the Pirates, 6 – 2. After signing a ten-year lease for $20,000 annually with Browns’ president Phil Ball, the team moves six blocks to be able to play its home games in a modern ballpark.

On july 1, 1920 Leaving Robison Field in mid-season, the Cardinals make their debut as the home team at Sportsman’s Park, also the home of the American League’s St. Louis Browns, bowing to the Pirates, 6 – 2. After signing a ten-year lease for $20,000 annually with Browns’ president Phil Ball, the team moves six blocks to be able to play its home games in a modern ballpark.

Source
Baseball Reference July 1