October 15 – Denny McKnight organizes the Allegheny Baseball Club of Pittsburgh in anticipation of playing in the new American Association. The team, still in existence today, will become known as the Pittsburgh Pirates.

October 15 – Denny McKnight organizes the Allegheny Baseball Club of Pittsburgh in anticipation of playing in the new American Association. The team, still in existence today, will become known as the Pittsburgh Pirates.

October 10 – Initiated by backers of the new Cincinnati Red Stockings club, the first meetings are held in Pittsburgh of what would become the American Association.

October 10 – Initiated by backers of the new Cincinnati Red Stockings club, the first meetings are held in Pittsburgh of what would become the American Association.