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| U | Torpedo Kutaisi | - | PFC Ludogorets Razgrad | 0:1 (0:1) | ||
| R | PFC Ludogorets Razgrad | - | Torpedo Kutaisi | 4:0 (2:0) | ||
| U: 23.08.2018 18:00 | R: 30.08.2018 19:00 | Winnaars: PFC Ludogorets Razgrad | ||||
| U | Zenit St. Petersburg | - | Molde FK | 3:1 (0:1) | ||
| R | Molde FK | - | Zenit St. Petersburg | 2:1 (0:1) | ||
| U: 23.08.2018 18:00 | R: 30.08.2018 19:00 | Winnaars: Zenit St. Petersburg | ||||
| U | AS Trenčín | - | AEK Larnaca | 1:1 (0:0) | ||
| R | AEK Larnaca | - | AS Trenčín | 3:0 (2:0) | ||
| U: 23.08.2018 18:30 | R: 30.08.2018 17:30 | Winnaars: AEK Larnaca | ||||
| U | APOEL Nicosia | - | FK Astana | 1:0 (0:0) | ||
| R | FK Astana | - | APOEL Nicosia | 2:1 (1:0, 1:0, 1:0) d.p. | ||
| U: 23.08.2018 19:00 | R: 30.08.2018 16:00 | Winnaars: FK Astana | ||||
| U | FK Sūduva | - | Celtic FC | 1:1 (1:1) | ||
| R | Celtic FC | - | FK Sūduva | 3:0 (1:0) | ||
| U: 23.08.2018 19:00 | R: 30.08.2018 21:00 | Winnaars: Celtic FC | ||||
| U | FC Sheriff | - | Qarabağ FK | 1:0 (1:0) | ||
| R | Qarabağ FK | - | FC Sheriff | 3:0 (2:0) | ||
| U: 23.08.2018 19:00 | R: 30.08.2018 19:00 | Winnaars: Qarabağ FK | ||||
| U | Sigma Olomouc | - | Sevilla FC | 0:1 (0:0) | ||
| R | Sevilla FC | - | Sigma Olomouc | 3:0 (2:0) | ||
| U: 23.08.2018 19:00 | R: 30.08.2018 21:45 | Winnaars: Sevilla FC | ||||
| U | Sarpsborg 08 | - | Maccabi Tel Aviv | 3:1 (2:1) | ||
| R | Maccabi Tel Aviv | - | Sarpsborg 08 | 2:1 (0:0) | ||
| U: 23.08.2018 19:05 | R: 30.08.2018 19:00 | Winnaars: Sarpsborg 08 | ||||
| U | Malmö FF | - | FC Midtjylland | 2:2 (2:0) | ||
| R | FC Midtjylland | - | Malmö FF | 0:2 (0:1) | ||
| U: 23.08.2018 19:15 | R: 30.08.2018 19:15 | Winnaars: Malmö FF | ||||
| U | F91 Dudelange | - | CFR Cluj | 2:0 (0:0) | ||
| R | CFR Cluj | - | F91 Dudelange | 2:3 (0:0) | ||
| U: 23.08.2018 20:00 | R: 30.08.2018 19:00 | Winnaars: F91 Dudelange | ||||
| U | FC Basel | - | Apollon Limassol | 3:2 (1:0) | ||
| R | Apollon Limassol | - | FC Basel | 1:0 (0:0) | ||
| U: 23.08.2018 20:00 | R: 30.08.2018 19:00 | Winnaars: Apollon Limassol | ||||
| U | Atalanta | - | FC Kopenhagen | 0:0 (0:0) | ||
| R | FC Kopenhagen | - | Atalanta | 4:3 (0:0, 0:0, 0:0) d.p. | ||
| U: 23.08.2018 20:00 | R: 30.08.2018 18:30 | Winnaars: FC Kopenhagen | ||||
| U | Olympiakos | - | Burnley FC | 3:1 (1:1) | ||
| R | Burnley FC | - | Olympiakos | 1:1 (0:0) | ||
| U: 23.08.2018 20:00 | R: 30.08.2018 20:45 | Winnaars: Olympiakos | ||||
| U | Olimpija Ljubljana | - | Spartak Trnava | 0:2 (0:2) | ||
| R | Spartak Trnava | - | Olimpija Ljubljana | 1:1 (1:1) | ||
| U: 23.08.2018 20:30 | R: 30.08.2018 20:30 | Winnaars: Spartak Trnava | ||||
| U | Rapid Wien | - | FCSB | 3:1 (2:0) | ||
| R | FCSB | - | Rapid Wien | 2:1 (2:0) | ||
| U: 23.08.2018 20:30 | R: 30.08.2018 20:30 | Winnaars: Rapid Wien | ||||
| U | Partizan | - | Beşiktaş | 1:1 (1:1) | ||
| R | Beşiktaş | - | Partizan | 3:0 (2:0) | ||
| U: 23.08.2018 20:30 | R: 30.08.2018 20:00 | Winnaars: Beşiktaş | ||||
| U | KRC Genk | - | Brøndby IF | 5:2 (2:0) | ||
| R | Brøndby IF | - | KRC Genk | 2:4 (1:2) | ||
| U: 23.08.2018 20:30 | R: 30.08.2018 20:30 | Winnaars: KRC Genk | ||||
| U | Zorya Lugansk | - | RB Leipzig | 0:0 (0:0) | ||
| R | RB Leipzig | - | Zorya Lugansk | 3:2 (1:1) | ||
| U: 23.08.2018 20:30 | R: 30.08.2018 18:30 | Winnaars: RB Leipzig | ||||
| U | Rosenborg BK | - | KF Shkëndija 79 | 3:1 (3:0) | ||
| R | KF Shkëndija 79 | - | Rosenborg BK | 0:2 (0:0) | ||
| U: 23.08.2018 20:45 | R: 30.08.2018 20:15 | Winnaars: Rosenborg BK | ||||
| U | Rangers FC | - | FK Ufa | 1:0 (1:0) | ||
| R | FK Ufa | - | Rangers FC | 1:1 (1:1) | ||
| U: 23.08.2018 20:45 | R: 30.08.2018 16:00 | Winnaars: Rangers FC | ||||
| U | KAA Gent | - | Girondins Bordeaux | 0:0 (0:0) | ||
| R | Girondins Bordeaux | - | KAA Gent | 2:0 (1:0) | ||
| U: 23.08.2018 20:45 | R: 30.08.2018 20:45 | Winnaars: Girondins Bordeaux | ||||
