The first South Side Park was the home of the short-lived Chicago Browns entry in the Union Association of 1884. Newspapers gave its location as "the corner of 39th Street and South Wabash Avenue", not specifying which corner.

The venue was also called Union Base Ball Park and 39th Street Grounds in local newspapers. A late-winter report on "improvements" to the 39th Street Grounds indicates the site had already been used as an amateur ball field.

The Unions played 35 games at this park between May 2 and August 1. The papers indicated they were then headed on a three-week road trip. After that road trip, they re-emerged as the Pittsburgh entry, which played five home games at Exposition Park before taking to the road for the last few weeks of their existence.

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