 Standings at start of day | Results for September 10, 1888 Game 400: Des Moines 9, Chicago 0 Game 1 |
| Game 400: Chicago @ Des Moines Des Moines 9, Chicago 0 Chicago Tribune  Game 1 | Game 401: Chicago @ Des Moines Des Moines 10, Chicago 3 Chicago Tribune  Game 2 | Game 402: Milwaukee @ Omaha Omaha 7, Milwaukee 1 Omaha Daily Bee  |