4th After 22 unsuccessful attempts, Cincinnati becomes the first AA team to defeat an NL team, beating Cleveland, 5–2.
6th In the first post-season matchup between the AA and NL champions, Cincinnati shuts out Chicago, 4–0, behind Will White.
7th In another matchup between the AA and NL champs, Chicago returns the favor by blanking Cincinnati, 2–0. Chicago scores both its runs in the 1stinning following a successful hit-and-run play with George Gore on 1B and Ned Williamson hitting. Following the game, Cincinnati, under pressure from the AA, reluctantly cancels the exhibition series to avoid expulsion from the league.
14th Columbus, which will join the AA in 1883, is officially incorporated with $5,000 in capital stock.
28th The Athletics reveal that in their first AA season they reaped a $22,000 profit, more than any NL team earned. This helps convince the NL that the AA is a viable league.