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| 1st(1st leg) | Deportes Temuco | - | Unión San Felipe | 0:0 (0:0) | ||
| 2nd (2nd leg) | Unión San Felipe | - | Deportes Temuco | 1:0 (0:0) | ||
| 1st(1st leg): 23/08/2017 22:00 | 2nd (2nd leg): 31/08/2017 00:00 | Winner: Unión San Felipe | ||||
| 1st(1st leg) | San Luis | - | Coquimbo Unido | 2:2 (1:1) | ||
| 2nd (2nd leg) | Coquimbo Unido | - | San Luis | 1:4 (0:1) | ||
| 1st(1st leg): 23/08/2017 23:30 | 2nd (2nd leg): 02/09/2017 00:00 | Winner: San Luis | ||||
| 1st(1st leg) | Universidad Católica | - | Huachipato | 1:1 (0:0) | ||
| 2nd (2nd leg) | Huachipato | - | Universidad Católica | 3:2 (1:0) | ||
| 1st(1st leg): 24/08/2017 00:00 | 2nd (2nd leg): 07/09/2017 00:00 | Winner: Huachipato | ||||
| 1st(1st leg) | San Marcos | - | Antofagasta | 0:4 (0:1) | ||
| 2nd (2nd leg) | Antofagasta | - | San Marcos | 4:2 (4:1) | ||
| 1st(1st leg): 24/08/2017 01:30 | 2nd (2nd leg): 06/09/2017 23:45 | Winner: Antofagasta | ||||
| 1st(1st leg) | Curicó Unido | - | Palestino | 2:1 (0:1) | ||
| 2nd (2nd leg) | Palestino | - | Curicó Unido | 1:2 (1:1) | ||
| 1st(1st leg): 30/08/2017 00:00 | 2nd (2nd leg): 02/09/2017 16:00 | Winner: Curicó Unido | ||||
| 1st(1st leg) | Audax Italiano | - | Universidad de Chile | 0:3 (0:3) | ||
| 2nd (2nd leg) | Universidad de Chile | - | Audax Italiano | 1:0 (1:0) | ||
| 1st(1st leg): 30/08/2017 22:00 | 2nd (2nd leg): 02/09/2017 23:00 | Winner: Universidad de Chile | ||||
| 1st(1st leg) | Deportes Iberia | - | Colo-Colo | 3:2 (0:0) | ||
| 2nd (2nd leg) | Colo-Colo | - | Deportes Iberia | 0:2 (0:1) | ||
| 1st(1st leg): 31/08/2017 00:30 | 2nd (2nd leg): 03/09/2017 21:00 | Winner: Deportes Iberia | ||||
| 1st(1st leg) | O'Higgins | - | Santiago Wanderers | 0:2 (0:2) | ||
| 2nd (2nd leg) | Santiago Wanderers | - | O'Higgins | 2:0 (1:0) | ||
| 1st(1st leg): 31/08/2017 20:30 | 2nd (2nd leg): 04/09/2017 00:00 | Winner: Santiago Wanderers | ||||
