1888 – The St. Louis Browns of the American Association open the training season with an exhibition game versus the St. Louis Whites, a new Western Association team. Among the 10 cities in the W.A., four also host major league clubs

On March 25, 1888 — 1888 – The St. Louis Browns of the American Association open the training season with an exhibition game versus the St. Louis Whites, a new Western Association team. Among the 10 cities in the W.A., four also host major league clubs

Sources –
Baseball Reference March 25
SABR Games Project
National Pastime March 25
Retro Sheet
Replay The Game

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