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| 1st(1st leg) | Torpedo Kutaisi | - | FC Sheriff | 2:1 (1:1) | ||
| 2nd (2nd leg) | FC Sheriff | - | Torpedo Kutaisi | 3:0 (2:0) | ||
| 1st(1st leg): 10/07/2018 16:30 | 2nd (2nd leg): 18/07/2018 18:00 | Winner: FC Sheriff | ||||
| 1st(1st leg) | FC Flora | - | Hapoel Be'er Sheva | 1:4 (0:2) | ||
| 2nd (2nd leg) | Hapoel Be'er Sheva | - | FC Flora | 3:1 (2:0) | ||
| 1st(1st leg): 10/07/2018 16:30 | 2nd (2nd leg): 17/07/2018 18:00 | Winner: Hapoel Be'er Sheva | ||||
| 1st(1st leg) | F91 Dudelange | - | MOL Vidi FC | 1:1 (0:1) | ||
| 2nd (2nd leg) | MOL Vidi FC | - | F91 Dudelange | 2:1 (1:0) | ||
| 1st(1st leg): 10/07/2018 17:00 | 2nd (2nd leg): 17/07/2018 19:15 | Winner: MOL Vidi FC | ||||
| 1st(1st leg) | FC Alashkert | - | Celtic FC | 0:3 (0:1) | ||
| 2nd (2nd leg) | Celtic FC | - | FC Alashkert | 3:0 (3:0) | ||
| 1st(1st leg): 10/07/2018 17:00 | 2nd (2nd leg): 18/07/2018 19:45 | Winner: Celtic FC | ||||
| 1st(1st leg) | Víkingur | - | HJK Helsinki | 1:2 (0:2) | ||
| 2nd (2nd leg) | HJK Helsinki | - | Víkingur | 3:1 (3:1) | ||
| 1st(1st leg): 10/07/2018 19:00 | 2nd (2nd leg): 17/07/2018 17:00 | Winner: HJK Helsinki | ||||
| 1st(1st leg) | KF Shkëndija 79 | - | The New Saints | 5:0 (2:0) | ||
| 2nd (2nd leg) | The New Saints | - | KF Shkëndija 79 | 4:0 (3:0) | ||
| 1st(1st leg): 10/07/2018 19:15 | 2nd (2nd leg): 17/07/2018 19:00 | Winner: KF Shkëndija 79 | ||||
| 1st(1st leg) | Drita Gjilan | - | Malmö FF | 0:3 (0:2) | ||
| 2nd (2nd leg) | Malmö FF | - | Drita Gjilan | 2:0 (0:0) | ||
| 1st(1st leg): 10/07/2018 19:45 | 2nd (2nd leg): 17/07/2018 18:00 | Winner: Malmö FF | ||||
| 1st(1st leg) | Cork City | - | Legia Warszawa | 0:1 (0:0) | ||
| 2nd (2nd leg) | Legia Warszawa | - | Cork City | 3:0 (1:0) | ||
| 1st(1st leg): 10/07/2018 19:45 | 2nd (2nd leg): 17/07/2018 20:00 | Winner: Legia Warszawa | ||||
| 1st(1st leg) | FK Astana | - | FK Sutjeska | 1:0 (1:0) | ||
| 2nd (2nd leg) | FK Sutjeska | - | FK Astana | 0:2 (0:1) | ||
| 1st(1st leg): 11/07/2018 15:00 | 2nd (2nd leg): 18/07/2018 19:00 | Winner: FK Astana | ||||
| 1st(1st leg) | FK Sūduva | - | APOEL Nikosia | 3:1 (3:0) | ||
| 2nd (2nd leg) | APOEL Nikosia | - | FK Sūduva | 1:0 (1:0) | ||
| 1st(1st leg): 11/07/2018 17:00 | 2nd (2nd leg): 17/07/2018 18:00 | Winner: FK Sūduva | ||||
| 1st(1st leg) | FK Spartaks | - | Crvena Zvezda | 0:0 (0:0) | ||
| 2nd (2nd leg) | Crvena Zvezda | - | FK Spartaks | 2:0 (0:0) | ||
| 1st(1st leg): 11/07/2018 17:00 | 2nd (2nd leg): 17/07/2018 19:30 | Winner: Crvena Zvezda | ||||
| 1st(1st leg) | Spartak Trnava | - | Zrinjski Mostar | 1:0 (0:0) | ||
| 2nd (2nd leg) | Zrinjski Mostar | - | Spartak Trnava | 1:1 (0:1) | ||
| 1st(1st leg): 11/07/2018 17:00 | 2nd (2nd leg): 18/07/2018 18:00 | Winner: Spartak Trnava | ||||
| 1st(1st leg) | PFC Ludogorets Razgrad | - | Crusaders FC | 7:0 (2:0) | ||
| 2nd (2nd leg) | Crusaders FC | - | PFC Ludogorets Razgrad | 0:2 (0:1) | ||
| 1st(1st leg): 11/07/2018 18:00 | 2nd (2nd leg): 17/07/2018 20:00 | Winner: PFC Ludogorets Razgrad | ||||
| 1st(1st leg) | FK Kukësi | - | Valletta FC | 0:0 (0:0) | ||
| 2nd (2nd leg) | Valletta FC | - | FK Kukësi | 1:1 (0:0) | ||
| 1st(1st leg): 11/07/2018 18:00 | 2nd (2nd leg): 17/07/2018 17:00 | Winner: FK Kukësi | ||||
| 1st(1st leg) | Olimpija Ljubljana | - | Qarabağ FK | 0:1 (0:0) | ||
| 2nd (2nd leg) | Qarabağ FK | - | Olimpija Ljubljana | 0:0 (0:0) | ||
| 1st(1st leg): 11/07/2018 19:00 | 2nd (2nd leg): 18/07/2018 18:00 | Winner: Qarabağ FK | ||||
| 1st(1st leg) | Valur Reykjavík | - | Rosenborg BK | 1:0 (0:0) | ||
| 2nd (2nd leg) | Rosenborg BK | - | Valur Reykjavík | 3:1 (0:0) | ||
| 1st(1st leg): 11/07/2018 21:00 | 2nd (2nd leg): 18/07/2018 18:45 | Winner: Rosenborg BK | ||||
