 USA: New Haven 2 - Singles - Main |
|---|
| 1/32-finals | Jarryd A. | Cassidy D. | 2:1 (7:6, 5:7, 6:1) | details | 13.08.1990 |
| USA: Kiawah Island - Singles - Main |
|---|
| 1/16-finals | Wostenholme M. | Cassidy D. | 2:0 (6:2, 6:1) | details | 07.05.1990 |
 Singapore: Singapore - Singles - Main |
|---|
| 1/16-finals | Cassidy D. | Hogstedt T. | 0:2 (3:6, 1:6) | details | 30.04.1990 |
 Japan: Tokyo - Singles - Main |
|---|
| 1/32-finals | Jarryd A. | Cassidy D. | 2:0 (6:0, 6:3) | details | 09.04.1990 |
 Brazil: Rio de Janeiro 2 - Singles - Main |
|---|
| 1/16-finals | Motta C. | Cassidy D. | 2:0 (6:4, 6:1) | details | 02.04.1990 |
| USA: Philadelphia - Singles - Main |
|---|
| 1/32-finals | Garner C. | Cassidy D. | 2:1 (7:5, 2:6, 7:5) | details | 19.02.1990 |
| USA: San Francisco - Singles - Main |
|---|
| 1/16-finals | Annacone P. | Cassidy D. | 2:0 (7:6, 7:6) | details | 05.02.1990 |
 Australia: Australian Open - Singles - Qualification |
|---|
| Final | Cassidy D. | Suk C. | 0:2 (2:6, 2:6) | details | 12.01.1990 |
| Semi-finals | Cassidy D. | Turner J. | 2:0 (7:5, 7:6) | details | 11.01.1990 |
| USA: Verizon Tennis Challenge - Doubles - Main |
|---|
| 1/8-finals | Cassidy D./Evernden K. | Davis S./Stolle S. | 0:2 (0:6, 1:6) | details | 29.04.1996 |
| USA: New Haven 2 - Doubles - Main |
|---|
| 1/16-finals | Barr S./Smith R. | Cassidy D./Yzaga J. | 2:1 (6:7, 7:5, 6:4) | details | 13.08.1990 |
| USA: Kiawah Island - Doubles - Main |
|---|
| 1/8-finals | Cassidy D./Shelton B. | Pearce B./Reneberg R. | 1:2 (6:1, 5:7, 6:7) | details | 07.05.1990 |
 Hong Kong: Hong Kong - Doubles - Main |
|---|
| 1/8-finals | Davis S./McEnroe P. | Canter J./Cassidy D. | 2:0 (6:4, 6:1) | details | 23.04.1990 |
 South Korea: Seoul - Doubles - Main |
|---|
| 1/8-finals | Cassidy D./Saceanu C. | Brown N./Castle A. | 0:2 (4:6, 3:6) | details | 16.04.1990 |
| Japan: Tokyo - Doubles - Main |
|---|
| 1/8-finals | Kratzmann M./Masur W. | Cassidy D./Laurendeau M. | 2:0 (6:4, 6:4) | details | 11.04.1990 |
| 1/16-finals | Tanizawa H./Yamamoto Y. | Cassidy D./Laurendeau M. | 1:2 (6:4, 5:7, 4:6) | details | 09.04.1990 |
| Brazil: Rio de Janeiro 2 - Doubles - Main |
|---|
| Semi-finals | Cassidy D./Shelton B. | Aerts N./Roese F. | 0:2 (0:6, 6:7) | details | 07.04.1990 |
| Quarter-finals | Frana J./Luza G. | Cassidy D./Shelton B. | 0:2 (4:6, 6:7) | details | 04.04.1990 |
| 1/8-finals | Cassidy D./Shelton B. | Albano P./Mirad G. | 2:1 (6:3, 6:7, 6:4) | details | 02.04.1990 |
 Canada: Toronto 2 - Doubles - Main |
|---|
| 1/16-finals | Cassidy D./Shiras L. | Lozano J./Witsken T. | 0:2 (4:6, 4:6) | details | 12.02.1990 |
| Australia: Australian Open - Doubles - Main |
|---|
| 1/8-finals | Cassidy D./Pozzi G. | Davis S./Van't Hof R. | 1:2 (5:7, 6:3, 2:6) | details | 21.01.1990 |
| 1/16-finals | Cassidy D./Pozzi G. | Adams D./Altur J. F. | 2:0 (6:3, 6:4) | details | 17.01.1990 |
| 1/32-finals | Courier J./Sampras P. | Cassidy D./Pozzi G. | 0:2 (4:6, 4:6) | details | 15.01.1990 |
