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