The National League and the American Association faced each other in a World's Championship Series at the end of the season to determine an overall champion.
Champ
NYG
1889 NL Champion New York Giants
z: best record, c: conference winner, y: division winner, w: wildcard, x: clinched playoff spot

World's Championship Series

Best of 11-game series
Home/Away matchups are not known
Date    OpponentResultScoreSeries
10/18vs BrooklynL  10-12 0-1
10/19at BrooklynW  6-2 1-1
10/22vs BrooklynL  7-8
8
1-2
10/23at BrooklynL  7-10
6
1-3
10/24at BrooklynW  11-3 2-3
10/25vs BrooklynW  2-1
11
3-3
10/26vs BrooklynW  11-7
8
4-3
10/28at BrooklynW  16-7 5-3
10/29vs BrooklynW  3-2 6-3