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| H | Árabe Unido | - | Arnett Gardens | 3:0 (0:0) | ||
| R | Arnett Gardens | - | Árabe Unido | 2:1 (1:1) | ||
| H: 01.08.2018 02:00 | R: 10.08.2018 04:00 | Sieger: Árabe Unido | ||||
| H | Motagua | - | Belmopan Bandits | 2:0 (0:0) | ||
| R | Belmopan Bandits | - | Motagua | 0:1 (0:0) | ||
| H: 01.08.2018 04:00 | R: 08.08.2018 02:00 | Sieger: Motagua | ||||
| H | FAS | - | Municipal Pérez Zeledón | 2:1 (0:1) | ||
| R | Municipal Pérez Zeledón | - | FAS | 1:1 (0:0) | ||
| H: 01.08.2018 04:00 | R: 08.08.2018 04:00 | Sieger: FAS | ||||
| H | Club Franciscain | - | CD Walter Ferretti | 1:0 (0:0) | ||
| R | CD Walter Ferretti | - | Club Franciscain | 4:1 (0:0, 1:0) i.E. | ||
| H: 02.08.2018 02:00 | R: 09.08.2018 02:00 | Sieger: CD Walter Ferretti | ||||
| H | Diriangén FC | - | UD Universitario | 0:4 (0:0) | ||
| R | UD Universitario | - | Diriangén FC | 3:1 (2:0) | ||
| H: 02.08.2018 02:00 | R: 08.08.2018 02:00 | Sieger: UD Universitario | ||||
| H | Santos de Guápiles | - | Portmore United | 1:2 (0:2) | ||
| R | Portmore United | - | Santos de Guápiles | 7:6 (1:2, 1:2) i.E. | ||
| H: 02.08.2018 04:00 | R: 10.08.2018 01:30 | Sieger: Portmore United | ||||
| H | Tauro FC | - | Real España | 1:0 (0:0) | ||
| R | Real España | - | Tauro FC | 1:1 (1:1) | ||
| H: 03.08.2018 02:00 | R: 10.08.2018 04:00 | Sieger: Tauro FC | ||||
| H | CS Herediano | - | Santa Tecla FC | 1:0 (1:0) | ||
| R | Santa Tecla FC | - | CS Herediano | 2:1 (2:1) | ||
| H: 03.08.2018 04:00 | R: 09.08.2018 04:00 | Sieger: CS Herediano | ||||
