 Italy: Genoa - Doubles - Main |
|---|
| Quarter-finals | Cierro M./Colombo S. | Gorriz M. A./Mora A. | 0:2 (6:7, 4:6) | details | 19.06.1991 |
| 1/8-finals | Gaudenzi A./Muster T. | Cierro M./Colombo S. | 1:2 (6:4, 4:6, 4:6) | details | 17.06.1991 |
| Italy: Rome - Doubles - Main |
|---|
| 1/16-finals | Cierro M./Colombo S. | Bahrami M./Winogradsky E. | 0:2 (3:6, 4:6) | details | 13.05.1991 |
 Switzerland: Geneva - Doubles - Main |
|---|
| Quarter-finals | Borwick N./Lewis D. | Colombo S./Olhovskiy A. | 2:1 (7:6, 3:6, 6:2) | details | 13.09.1990 |
| 1/8-finals | Colombo S./Olhovskiy A. | De La Pena H./MacPherson D. | 2:1 (7:6, 6:7, 6:4) | details | 10.09.1990 |
 San Marino: San Marino - Doubles - Main |
|---|
| 1/8-finals | Colombo S./Mezzadri C. | Boscatto M./Visconti M. | 1:2 (7:6, 4:6, 2:6) | details | 20.08.1990 |
 Austria: Kitzbuhel - Doubles - Main |
|---|
| 1/16-finals | Stankovic B./Vogel R. | Cierro M./Colombo S. | 2:0 (6:1, 6:2) | details | 30.07.1990 |
 Germany: Stuttgart - Doubles - Main |
|---|
| 1/16-finals | Mordegan F./Roig F. | Baguena J. C./Colombo S. | 2:0 (6:3, 6:3) | details | 16.07.1990 |
 United Kingdom: Wimbledon - Doubles - Main |
|---|
| 1/32-finals | Doohan P./Warder L. | Colombo S./Pozzi G. | 3:2 (6:3, 3:6, 6:3, 6:7, 6:4) | details | 30.06.1990 |
| Italy: Genoa - Doubles - Main |
|---|
| Semi-finals | Carbonell T./Riglewski U. | Baguena J. C./Colombo S. | 2:0 (6:1, 6:4) | details | 23.06.1990 |
| Quarter-finals | Baguena J. C./Colombo S. | Altur J. F./Perez D. | 2:0 (6:1, 6:4) | details | 21.06.1990 |
| 1/8-finals | Baguena J. C./Colombo S. | Clavet F./De La Pena H. | 2:0 (7:6, 7:6) | details | 18.06.1990 |
| Italy: Bologna - Doubles - Main |
|---|
| 1/8-finals | Colombo S./Di Laura C. | Lozano J./Witsken T. | 0:1 RET. (1:6, 1:2) | details | 18.06.1990 |
| Italy: Florence - Doubles - Main |
|---|
| 1/8-finals | Nilsson F./Svantesson T. | Colombo S./Skoff H. | 2:1 (4:6, 7:6, 6:4) | details | 11.06.1990 |
| Italy: Rome - Doubles - Main |
|---|
| Semi-finals | Colombo S./Utgren N. | Casal S./Sanchez E. | 0:2 (2:6, 3:6) | details | 19.05.1990 |
| Quarter-finals | Jaite M./Motta C. | Colombo S./Utgren N. | 0:2 (6:7, 3:6) | details | 18.05.1990 |
| 1/8-finals | Colombo S./Utgren N. | Camporese O./Cane P. | WO. | details | 16.05.1990 |
| 1/16-finals | Gilbert B./Nargiso D. | Colombo S./Utgren N. | 0:2 (4:6, 4:6) | details | 14.05.1990 |
 Monaco: Monte Carlo - Doubles - Main |
|---|
| 1/16-finals | Novacek K./Srejber M. | Cierro M./Colombo S. | 2:0 (7:6, 6:2) | details | 23.04.1990 |
 Brazil: Rio de Janeiro 2 - Doubles - Main |
|---|
| 1/8-finals | Colombo S./Osterthun R. | Camargo R./Kley I. | 0:2 (3:6, 3:6) | details | 02.04.1990 |
 Morocco: Casablanca - Doubles - Main |
|---|
| Semi-finals | Cierro M./Colombo S. | Woodbridge T./Youl S. | 0:2 (3:6, 2:6) | details | 10.03.1990 |
| Quarter-finals | Cierro M./Colombo S. | Henricsson P./Utgren N. | 2:1 (6:7, 6:1, 7:5) | details | 07.03.1990 |
| 1/8-finals | Segarceanu F./Vajda M. | Cierro M./Colombo S. | 0:2 (4:6, 4:6) | details | 05.03.1990 |
| Italy: Milan - Doubles - Main |
|---|
| 1/8-finals | Jelen E./Mortensen M. | Colombo S./Osterthun R. | 2:0 (6:4, 6:4) | details | 05.02.1990 |
