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| 1st(1st leg) | Internacional | - | Grêmio Porto Alegre | 1:2 (1:0) | ||
| 2nd (2nd leg) | Grêmio Porto Alegre | - | Internacional | 1:1 (1:0) | ||
| 1st(1st leg): 16/05/2021 20:00 | 2nd (2nd leg): 23/05/2021 20:00 | Winner: Grêmio Porto Alegre | ||||
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| 1st(1st leg) | Internacional | - | Grêmio Porto Alegre | 1:2 (1:0) | ||
| 2nd (2nd leg) | Grêmio Porto Alegre | - | Internacional | 1:1 (1:0) | ||
| 1st(1st leg): 16/05/2021 20:00 | 2nd (2nd leg): 23/05/2021 20:00 | Winner: Grêmio Porto Alegre | ||||
