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| 1st(1st leg) | Universidad de Chile | - | Cobreloa | 2:1 (1:0) | ||
| 2nd (2nd leg) | Cobreloa | - | Universidad de Chile | 2:3 (0:0) | ||
| 1st(1st leg): 07/07/2018 22:30 | 2nd (2nd leg): 14/07/2018 20:30 | Winner: Universidad de Chile | ||||
| 1st(1st leg) | Deportes Valdivia | - | Barnechea | 0:1 (0:0) | ||
| 2nd (2nd leg) | Barnechea | - | Deportes Valdivia | 5:4 (0:0, 1:2) pso | ||
| 1st(1st leg): 08/07/2018 17:30 | 2nd (2nd leg): 14/07/2018 01:00 | Winner: Barnechea | ||||
| 1st(1st leg) | Cobresal | - | Palestino | 1:1 (1:1) | ||
| 2nd (2nd leg) | Palestino | - | Cobresal | 1:0 (0:0) | ||
| 1st(1st leg): 08/07/2018 20:30 | 2nd (2nd leg): 14/07/2018 23:00 | Winner: Palestino | ||||
| 1st(1st leg) | Audax Italiano | - | Huachipato | 2:1 (2:1) | ||
| 2nd (2nd leg) | Huachipato | - | Audax Italiano | 1:2 (0:0) | ||
| 1st(1st leg): 08/07/2018 23:00 | 2nd (2nd leg): 14/07/2018 17:30 | Winner: Audax Italiano | ||||
