4th The newly organized Union League changes its name to the Eastern League to avoid confusion with the new Union Association. The EL continues today as the AAA International League.
Pitcher Larry Corcoran, who had signed with Chicago of the outlaw UA, breaks his contract to re-sign with his old club, Chicago’s NL White Stockings.
10thAt the annual meeting of the minor-league Northwest League, 1st-place Toledo is declared the league champion for 1883. But because Toledo has moved from the NWL to the major league AA for 1884, the NWL pennant is awarded to 2nd-place Saginaw, MI. The NWL also rescinds its prohibition of Sunday baseball and the sale of beer at its ball parks, thereby aligning itself with AA policy and against the NL policy.
12thIn a 5-inning game played on ice skates in Brooklyn, Chicago ace Larry Corcoran hurls his team of mostly amateurs to a 41–12 win over a team composed of mostly professionals. Corcoran’s team was assembled by veteran writer Henry Chadwick). In 4 days the pros beat Corcoran and another group of amateurs, 16–8.
30thTony Mullane, ace of the 1883 St. Louis Browns (AA), and who signed for 1884 with the rival St. Louis Unions (UA), repudiates his UA contract and signs with the AA Toledo club. When Mullane signed with the UA, he was the first player to violate the National Agreement’s reserve clause.
The Chicago Union club inks One Arm Daily after pitcher Larry Corcoran returns the $1,000 advance he got for signing with the team. At the same time the New York owner John Day, drafts a resolution that permanently blacklists all players who sign with the Union teams.