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| 1st(1st leg) | Juventude - RS | - | Internacional | 1:0 (0:0) | ||
| 2nd (2nd leg) | Internacional | - | Juventude - RS | 4:1 (4:1) | ||
| 1st(1st leg): 02/05/2021 20:00 | 2nd (2nd leg): 08/05/2021 23:00 | Winner: Internacional | ||||
| 1st(1st leg) | S.E.R. Caxias - RS | - | Grêmio Porto Alegre | 1:2 (1:1) | ||
| 2nd (2nd leg) | Grêmio Porto Alegre | - | S.E.R. Caxias - RS | 2:0 (2:0) | ||
| 1st(1st leg): 02/05/2021 23:00 | 2nd (2nd leg): 09/05/2021 20:00 | Winner: Grêmio Porto Alegre | ||||
