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| H | AS Bari | - | AC Milan | 0:1 (0:0) | ||
| R | AC Milan | - | AS Bari | 0:0 (0:0) | ||
| H: 06.02.1991 20:15 | R: 20.02.1991 20:30 | Sieger: AC Milan | ||||
| H | SSC Napoli | - | Bologna FC | 0:1 (0:0) | ||
| R | Bologna FC | - | SSC Napoli | 1:3 (0:0) | ||
| H: 06.02.1991 20:30 | R: 20.02.1991 20:30 | Sieger: SSC Napoli | ||||
| H | Torino FC | - | Sampdoria | 1:0 (1:0) | ||
| R | Sampdoria | - | Torino FC | 4:2 (1:0, 1:0, 1:0) i.E. | ||
| H: 06.02.1991 20:30 | R: 19.02.1991 | Sieger: Sampdoria | ||||
| H | AS Roma | - | Juventus | 1:1 (1:0) | ||
| R | Juventus | - | AS Roma | 0:2 (0:2) | ||
| H: 07.02.1991 | R: 20.02.1991 20:30 | Sieger: AS Roma | ||||
