 Standings at start of day | Results for September 19, 1888 Omaha @ Sioux City () |
| Game 425: Des Moines @ Kansas City Kansas City 5, Des Moines 0 Kansas City Times  | Game 426: Omaha @ Sioux City Sioux City 5, Omaha 2 Sioux City Journal  | Game 427: St. Paul @ Milwaukee Milwaukee 3, St. Paul 0 Milwaukee Sentinel  |