 Standings at start of day | Results for September 4, 1888 Game 373: Milwaukee 7, Des Moines 4 |
| Game 373: Milwaukee @ Des Moines Milwaukee 7, Des Moines 4 Milwaukee Sentinel  | Game 374: Davenport @ Kansas City Kansas City 11, Davenport 6 Kansas City Times  | Game 375: Chicago @ Omaha Chicago 5, Omaha 1 Omaha Daily Bee  | Game 376: Sioux City @ St. Paul St. Paul 6, Sioux City 5 St. Paul Globe  |