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| 1st(1st leg) | Curicó Unido | - | Antofagasta | 1:1 (0:0) | ||
| 2nd (2nd leg) | Antofagasta | - | Curicó Unido | 4:2 (0:0, 0:0) pso | ||
| 1st(1st leg): 13/09/2017 21:30 | 2nd (2nd leg): 08/10/2017 20:00 | Winner: Antofagasta | ||||
| 1st(1st leg) | Unión San Felipe | - | Huachipato | 1:3 (1:0) | ||
| 2nd (2nd leg) | Huachipato | - | Unión San Felipe | 1:1 (0:0) | ||
| 1st(1st leg): 14/09/2017 00:00 | 2nd (2nd leg): 28/09/2017 01:00 | Winner: Huachipato | ||||
| 1st(1st leg) | San Luis | - | Universidad de Chile | 0:1 (0:1) | ||
| 2nd (2nd leg) | Universidad de Chile | - | San Luis | 2:2 (1:0) | ||
| 1st(1st leg): 14/09/2017 21:30 | 2nd (2nd leg): 09/10/2017 21:00 | Winner: Universidad de Chile | ||||
| 1st(1st leg) | Deportes Iberia | - | Santiago Wanderers | 1:1 (0:0) | ||
| 2nd (2nd leg) | Santiago Wanderers | - | Deportes Iberia | 4:3 (0:0, 1:1) pso | ||
| 1st(1st leg): 15/09/2017 00:00 | 2nd (2nd leg): 27/09/2017 22:00 | Winner: Santiago Wanderers | ||||
