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| H | Atlético Tucumán | - | Grêmio Porto Alegre | 0:2 (0:1) | ||
| R | Grêmio Porto Alegre | - | Atlético Tucumán | 4:0 (2:0) | ||
| H: 19.09.2018 02:45 | R: 03.10.2018 02:45 | Sieger: Grêmio Porto Alegre | ||||
| H | Independiente | - | River Plate | 0:0 (0:0) | ||
| R | River Plate | - | Independiente | 3:1 (0:0) | ||
| H: 20.09.2018 00:30 | R: 03.10.2018 00:30 | Sieger: River Plate | ||||
| H | Boca Juniors | - | Cruzeiro | 2:0 (1:0) | ||
| R | Cruzeiro | - | Boca Juniors | 1:1 (0:0) | ||
| H: 20.09.2018 02:45 | R: 05.10.2018 02:45 | Sieger: Boca Juniors | ||||
| H | Colo-Colo | - | Palmeiras | 0:2 (0:1) | ||
| R | Palmeiras | - | Colo-Colo | 2:0 (1:0) | ||
| H: 21.09.2018 02:45 | R: 04.10.2018 02:45 | Sieger: Palmeiras | ||||
