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| H | Al Jazira Club | - | Persepolis | 3:2 (0:1) | ||
| R | Persepolis | - | Al Jazira Club | 2:1 (0:0) | ||
| H: 07.05.2018 17:30 | R: 14.05.2018 17:00 | Sieger: Persepolis | ||||
| H | Al Sadd | - | Al Ahli SFC | 2:1 (2:0) | ||
| R | Al Ahli SFC | - | Al Sadd | 2:2 (2:1) | ||
| H: 07.05.2018 18:15 | R: 14.05.2018 19:40 | Sieger: Al Sadd | ||||
| H | Buriram United | - | Jeonbuk FC | 3:2 (1:0) | ||
| R | Jeonbuk FC | - | Buriram United | 2:0 (1:0) | ||
| H: 08.05.2018 13:00 | R: 15.05.2018 12:00 | Sieger: Jeonbuk FC | ||||
| H | Tianjin Quanjian FC | - | Guangzhou Evergrande | 0:0 (0:0) | ||
| R | Guangzhou Evergrande | - | Tianjin Quanjian FC | 2:2 (1:1) | ||
| H: 08.05.2018 13:30 | R: 15.05.2018 14:00 | Sieger: Tianjin Quanjian FC | ||||
| H | FC Zob Ahan | - | Esteghlal | 1:0 (0:0) | ||
| R | Esteghlal | - | FC Zob Ahan | 3:1 (2:0) | ||
| H: 08.05.2018 16:45 | R: 15.05.2018 18:15 | Sieger: Esteghlal | ||||
| H | Al Ain FC | - | Al Duhail SC | 2:4 (0:2) | ||
| R | Al Duhail SC | - | Al Ain FC | 4:1 (2:0) | ||
| H: 08.05.2018 18:10 | R: 15.05.2018 17:30 | Sieger: Al Duhail SC | ||||
| H | Kashima Antlers | - | Shanghai SIPG | 3:1 (1:0) | ||
| R | Shanghai SIPG | - | Kashima Antlers | 2:1 (1:1) | ||
| H: 09.05.2018 12:00 | R: 16.05.2018 14:00 | Sieger: Kashima Antlers | ||||
| H | Ulsan Hyundai FC | - | Suwon Bluewings | 1:0 (0:0) | ||
| R | Suwon Bluewings | - | Ulsan Hyundai FC | 3:0 (2:0) | ||
| H: 09.05.2018 13:00 | R: 16.05.2018 13:00 | Sieger: Suwon Bluewings | ||||
