January 28 - New York Supreme Court Justice Morgan J. O'Brien rules in favor of John Montgomery Ward's Reserve Clause case, and by extension the Players' League, by ruling baseball contracts lacked mutuality and were therefore unenforceable. This is the first in several rulings that allows the Players' League to proceed as planned.
February 1 - The National League finalizes its schedule for 1890, but refuses to release it. Speculation abounds that they are waiting for the Players' League to release their own schedule so that the new circuit may purposely schedule conflicting games in the same cities where both leagues have teams.