For this purpose the ownership built a second diamond and grandstand at the park, dividing it into eastern and western fields for use by the Giants and Metropolitans respectively. Polo Grounds I thus hosted its first Major League Baseball games in 1883 as the home stadium of two teams, the American Association Metropolitans and the National League Gothams. The dual-fields arrangement proved unworkable because of faulty surfacing of the western field, and after various other arrangements were tried, the Metropolitans and Giants alternated play on the eastern field in later years until the Metropolitans moved to the St. George Cricket Grounds on Staten Island in 1886.

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